In the case when the device fails to start and errors constantly occur during the download, you should try to use standard tool recovery. If it did not help or is not available, then you can try to fix the boot entries using the command line. How to do this will be described in this article. This method can help when it does not come to starting the OS itself.
bootrec.exe utility
First of all, the standard system recovery utility will be used, which will have to be called from the console.
Unfortunately, in order to start the console, additional steps are required. Will be necessary create a recovery disk or a disc with a version for windows installation. It's a good idea to have them always on hand, rather than rush to write them down on another device or with friends.
For the seven, you will need to select the item " System Restore”, and then launch the console. For the G8, the first item will remain unchanged, but then you have to go to diagnostics, from there call Extra options and only then start the console. 
In the window that appears, enter the command bootrec.exe, after which a list of available actions with all the necessary explanations will appear. Each point will be discussed in more detail below.
Write a new boot sector
The second command in this list will overwrite the current boot sector under the operating system that is available in this moment. Sector failures can occur for several reasons:
To fix all this, just enter the fixboot command as shown in the picture.
Fixing the MBR
This command, which is the first line, will allow you to correct the corresponding entries on the system hard drive. In fact, they responsible for order booting the system, from which the BIOS learns what to load and in what sequence. This operation can help if error occurrence:
You need to enter the fixmbr command as shown in the picture, and all these problems should disappear.
How to find all installed systems
There may be situations in which not all installed systems are available for boot. Performing the appropriate operation will allow check device for the presence of other installed operating systems, and using the next section of the article, they can be added to this list. The required command is shown in the picture. 
Rebuilding BCD
Entering the corresponding operation /RebuildBcd after the initial command will record all found OS and recovery tools to the configuration file Windows downloads, which will display them on the next boot. 
From the article it is clear that many problems with starting the system can be solved independently, using the command line and just one utility. So it's worth trying this option before you start to panic, rearrange the OS, or take your computer in for repair.
Or corrupted files (for example: NTLDR is missing. Press Ctrl+Alt+Del to restart, or Cannot start Windows due to corrupted or missing file: \WINDOWS\SYSTEM32\CONFIG\SYSTEM, or Cannot start Windows due to software errors. Please report this as a bug: needed DLLs for the kernel. Report this error to the support team).
At the same time, you can neither go to the restore point, nor load the last known good configuration, nor even boot into . In such cases, most immediately rush to reinstall, although, as a rule, you can restore the system to working capacity in 5 minutes using the so-called recovery console.
For this you need to BIOS install boot from CD-ROM" a, place in a tray CD-ROM" and the boot disk with the installation package Windows XP Professional and reboot. When the installer Windows XP upload your files to RAM , a window will appear Installing Windows XP Professional, containing the selection menu from which we are interested in the item *To restore Windows XP using the Recovery Console, click.
Click R . The recovery console will load. If onone is installed, and it is () installed on disk C:, the following message will appear:
1: C:\WINDOWS
Which copy Windows should you sign in?
Enter 1 , click Enter.
A message will appear:
Enter administrator password:
Enter password, click Enter(if there is no password, just click Enter).
The system prompt will appear:
C:\WINDOWS>
enter fixmbr
A message will appear:
**WARNING**
This computer has a non-standard or invalid master boot record. Using FIXMBR can damage the existing partition table. This will result in the loss of access to all partitions of the current hard drive.
If there are no disk access problems, it is recommended to abort the FIXMBR command.
Are you confirming the writing of the new MBR?
Enter y(which means yes).
A message will appear:
A new MBR is made to the physical disk \Device\Harddisk0\Partition0.
The new master boot record has been successfully made.
At the system prompt that appears: C:\WINDOWS>
Enter fixboot
A message will appear:
Destination partition: C:.
Do you want to write a new boot sector to the C: partition?
Enter y(which means yes).
A message will appear:
The file system on the boot partition is NTFS (or FAT32).
The FIXBOOT command writes a new boot sector.
The new boot sector has been successfully written.
Click Del, sign in BIOS Setup and install download from hard drive.
Notes
1. If you don't know what is And recovery console, in such critical situations – to avoid worsening the situation! – don't try to fix it yourself – it is better to seek help from specialists.
2. If on installed more than one , – contact the experts!
3. Brief reference on the commands used:
a) fixboot drivename:
This command is used to write a new boot sector code Windows in the system partition. In command syntax drive_name – disk on which the boot sector will be written. This command fixes corruption in the boot sector Windows. It overrides the settings , which are written to the boot partition of the system. Team fixboot supported on base x86.
b) fixmbr devicename
This command is used to restore the main boot record boot partition. In command syntax device_name – optional device name that requires a new master boot record ( MBR). Use this command if the boot record is run Windows fails.
home > Operating systems > Windows
Installing Windows 2000 Installation Problems
The system boot process can be divided into several stages:
Until the bootloader screen appears (menu for selecting the system you want to boot):
- Immediately after the completion of the self-test phase (POST), the computer freezes
- The bootloader screen does not appear.
- The following types of error messages appear on the screen:
- A disk read error occurred.
- Insert a system diskette and restart the system
- Hard Disk Error ( Hard bug disk).
- Hard Disk Absent/Failed
It is possible that in this scenario the computer will not be able to start at all. If you have previously formatted all partitions to use file system NTFS - you cannot use MS-DOS utilities to solve these problems. I advise you to keep Windows 2000 boot disks handy. This type problems can be caused by the following things:
- Missing system partition on hard drive. Usually occurs when a newly purchased hard drive is configured incorrectly or when it is incorrectly formatted. You can fix this problem using the FDISK utility.
- The master boot record is corrupted. What is it for?
- Reads the partition table located in this disk sector.
- Specifies the location of the partition's boot sector.
- Loads and executes code located in the partition's boot sector.
- Missing operating system.
- Invalid partition table (Invalid partition table).
You can use the Windows 2000 Recovery Console to repair a corrupted MBR. This is done using the Fixmbr command:
fixmbr [device name]
Parameter device_name: The device (disk) to which you want to write the new master boot record. You can use the map command to get the name. The device name might look like this:
\Device\HardDisk0.
The following example writes a new MBR to the above device.
fixmbr\Device\HardDisk0
If no device name is specified, the new MBR will be written to the boot device, which is the drive from which the main system was booted. If an incorrect or non-standard partition table signature is found, a message is displayed asking for confirmation of the write. If the disks are being accessed without failure, the confirmation should be answered in the negative. Writing a new MBR to system partition may corrupt partition tables, making partitions inaccessible. Partition boot sector corruption is usually characterized by a blue screen and a STOP error with the following content:
INACCESSIBLE_BOOT_DEVICE.
Or the machine "hangs" during the boot process and the screen remains blank. Even if there is no obvious gross damage, the boot sector of the partition may not work correctly. The problem may be that the NTLDR file is corrupted/corrupted, or the boot sector is corrupted. To diagnose the problem, we proceed in the following way: We try to rename the NTLDR file and start Windows 2000 from this hard disk. If the boot sector is OK, but the problem is corrupted file bootloader will display the following message:
Couldn't find NTLDR- if the bootloader file is on an NTFS partition
A kernel file is missing from the disk- if the NTLDR bootloader file is on the FAT partition.
Accordingly, it is required to replace the damaged NTLDR file with a working one (either from a boot diskette or from a working machine).
I immediately warn you that the default NTLDR file has the attributes "hidden", "system" and "read-only". If it is on a FAT partition, you can change the attributes from under DOS using the attrib -s -h -r ntldr command. If after replacing the NTLDR file you do not receive such error messages and the machine still does not want to boot, then the boot partition itself is damaged. To eliminate this trouble, you need to load the recovery console (ie, start the installation of Windows 2000 again and after the procedure for copying the installation files to the hard drive is completed, select NOT installation, BUT SYSTEM RECOVERY). After the console is loaded, use the following command:
Writing a new boot sector to the system partition. The fixboot command is only available on the Windows 2000 Recovery Console, which is run from a program Windows installation 2000.
fixboot [disk]
Parameter: the disk to which you want to write the boot sector. By default, the system partition from which the system was booted is used. In the following example, a new boot sector will be written to the system partition of drive D:
Problems that occur after the bootloader is launched, but before the user is logged into the system
The Windows 2000 Resource Kit contains a debug version of Ntdetect.com called Ntdetect.chk. If Ntdetect.com can't detect all the hardware devices you think it should find, you can use the debug version to help isolate the problem. The debug version is installed using the Installd.cmd file, which does the following:
- Renames the default Ntdetect.com.
- Copies Ntdetect.chk to Ntdetect.com.
After performing these operations, you need to restart your computer. When you start the system with the debug version of Ntdetect, information about all detected hardware will appear on the screen. After completing each information screen, you must press the Enter key. When the debug version is no longer needed, run the installd /not command.
The SOS setting in the Boot.ini file.
You can add the /sos option to the Boot.ini file, which will cause NTLDR to display the names of the kernel (Ntoskrnl.exe) and drivers as they are loaded. This will help diagnose problems with a missing or corrupted device driver.
Need good advice how to produce recovery Windows bootloader 7 if start recovery with installation disk seven did not help. I’ll briefly explain what’s the matter: Windows 7 was first installed on the computer, then Windows XP was needed as the second system, after installation it naturally started alone, I used to boot two operating systems EasyBCD program. In the future, XP became unnecessary and I formatted the partition on which it was located from Windows 7. Now, when loading, there is nothing but a black screen. What can be done in this case? More details if possible. Sergey.
Windows 7 bootloader recovery
Hello friends! Most importantly, do not worry, your problem is simple and, in principle, a simple tool "Restore Windows startup 7" described in our article should help, but! If this article does not help you, then two others should help:
These articles describe a few more good ways restore the boot of your operating system, besides them there is one more, so try it and just don't give up.
Let me remind you that you cannot install an older operating system after a younger one, Windows 7 will in no case boot after installation on Windows computer XP, since the latter overwrites the Master Boot Record (MBR) with itself during installation. Therefore, you installed an additional boot manager, which is used to configure the boot of several operating systems and has its own bootloader in turn.
- I also want to say that file system errors are often to blame for unsuccessful loading of Windows 7, you can fix them even when the operating system does not load, all the details in our other article " "
- Friends, in this article we will work with the Windows 7 Recovery Environment, or more precisely with the command line of the Recovery Environment. I will give you the necessary commands, but if it is difficult for you to remember them, you can. This will greatly facilitate your work.
- The Master Boot Record (MBR) is the first sector on the hard disk, which contains the partition table and a small bootloader program that reads data in this table from which partition of the hard disk to boot the OS, then the information is transferred to the partition with the installed operating system, to download it. If the master boot record contains incorrect information about the location of the system, then we will receive various errors during boot, here is one of them "BOOTMGR is missing press CTR-Alt-Del for restart" or we will observe a black screen. The problem is being fixed Windows 7 bootloader recovery.
When you uninstalled old XP along with EasyBCD, you left your computer to fend for itself with a boot record that it did not understand, and it gives you a black screen as a token of gratitude. To remedy the situation, we will boot recovery zchika Windows 7namely, we will overwrite the master boot record using the utility Bootrec.exelocated on the recovery disk or on the installation Windows disk 7 (friends, if you have a netbook and want to use the recovery environment located on the flash drive, then read the comments first). Also, with this utility, we will write a new boot sector, understandable by Windows 7.
Windows 7 Boot Repair Automatically
We boot from the recovery disk or the installation disk with Windows 7, in the initial phase of booting the computer, when prompted to boot from the disk "Press any key to boot from CD ...", press any key on the keyboard for 5 seconds, otherwise you will not boot from the disk
There is a short search installed systems Windows and analysis of problems preventing them from loading
Usually problems are found quickly and the recovery environment offers to fix them automatically. Click on the "Fix and restart" button, after which the computer will restart and the Windows 7 boot will be restored.
If the system boot problems continue or you are not prompted to fix the problems automatically, then in this window you need to select the operating system that you want to restore, you most likely have one and Next.
Choose a tool firstLaunch Recovery, it can also solve problems with loading Windows 7
Restoring the Windows 7 bootloader manually
If this remedy does not help, choose the remedy Command line
We enter the commands:
diskpart
lis vol (we display a list of hard disk partitions and see that "Volume 1" is a hidden partition System Reserved (Reserved by the system), the volume is 100 MB, it should contain files Windows boot 7 and it is he who needs to be made active). We also see a section with installed Windows 7, it has the letter D:, the volume is 60 GB.
sel vol 1 (select Volume 1)
activ (make it active)
exit (exit diskpart)
bcdboot D:\Windows (where D: is the partition where Windows 7 is installed), this command restores the Windows 7 boot files (the bootmgr file and the boot storage (BCD) configuration files)!
"Download files created successfully"
Restoring the Windows 7 bootloader manually (method number 2)
In the command prompt window, enter the Bootrec command and Enter
coming out full information about the possibilities of the utility. Select the MBR entry Bootrec.exe /FixMbr .
Operation completed successfully. A new boot record has been written to the first sector of the boot partition.
The second command Bootrec.exe /FixBoot writes a new boot sector.
Operation completed successfully. exit. Next, we try to load our Windows 7.
Friends, if the Bootrec.exe /FixMbr and Bootrec.exe /Fixboot commands do not help you, do not despair, there is one more tool.
Method number 3
We enter the command Bootrec /ScanOs, it will scan all your hard drives and partitions for operating systems, and if any are found, a corresponding warning will appear. Then you need to enter the command Bootrec.exe /RebuildBcd, this utility will offer to add the found Windows to the boot menu, agree and enter Y and press Enter, all the Windows found are added to the boot menu.
In my case, two operating systems were found. Everything is visible on the screenshot.
In addition to the above method, there is one more, enter into command line bootsect /NT60 SYS, the main boot code, will also be updated.
exit
So, the error is that on both hard drives, the first hidden sections System Reserved. On Windows 7, the volume of such a partition is 100 MB, and on Windows 8 350 MB, these partitions have the following attributes: System. Active and it is on these partitions that the boot storage configuration (BCD) files and the system boot manager file (the bootmgr file) reside. And we get these attributes are other sections. Because of this, Windows 7 and Windows 8 won't boot.
Choose the first HDD 1, click on the first partition System Reserved (Reserved by the system) with the right mouse and select "Mark as active"
The "System Reserved" volume will be marked as active. We press OK.
We do the same with Disk 2. Acronis Disk Director runs in pending operation mode, so that the changes take effect, click the "Apply pending operations" button
Continue.
As you can see, after our changes, those sections that you need have become active.
Exit the program and reboot. The result of the work is positive - both operating systems are loaded in turn.
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