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BOOTMGR is compressed

Cause:

The partition boot record found the critical system file bootmgr, located in the root directory, but the file is compressed and can't be used. Windows cannot begin without loading the uncompressed version of this file.

The bootmgr file is stored in the C: root directory as a hidden system file.

Workaround:

1. Fix Missing or Damaged Boot Manager

You can use Windows Recovery Console to fix a missing, damaged or compressed Boot Manager. First boot from your Windows boot DVD. We recommend you use a version that matches the OS service pack installed on your system (i.e. if you have Vista SP2, use a Vista SP2 DVD).

Go into the 7/Vista Recovery Console. Select the option "Startup Repair" to fix the problem.

Windows 7 - System Recovery Options (Startup Repair)

How to automatically repair Windows Vista using Startup Repair from Recovery Environment (Windows RE)?

2. Fix the Partition Boot Record

Windows provides tools to install a new partition boot record. Doing this does not erase any operating system files or your personal data. If this is the only damage, it has a good chance of fixing the problem, but if additional system sectors are damaged, recovery will be very difficult if not impossible.

To reset the Windows boot sector, boot from your Windows installation CD/DVD.
Go into the 7/Vista Recovery Console or XP Recovery Console and select Command prompt.

Description of the Windows XP Recovery Console.

How to use the Command Prompt from Windows Vista Recovery Environment?

Validate and Fix the File System

This runs the check disk program to detect and attempt to repair problems on one partition. For example, to repair the C: drive:

At the prompt type chkdsk c: /r

Repair the Boot Process

Windows XP:

Typically this is used if Windows doesn't start at all and you can't get to the safe mode menu. You might also replace the Master Boot Record (MBR) and/or the boot sector if you suspect a virus infection.

New MBR - Insert a new generic MBR without changing the partition table.

  • At the prompt, type: fixmbr

New Boot Sector - Insert a new Windows compatible boot sector.

  1. At the prompt, type: fixboot
  2. It will confirm the target partition is C (for at least 99.99% of installations). Type Y

Vista/ Windows 7

Typically this is used if Windows doesn't start and you can't get to the safe mode menu. You might also replace the Master Boot Record (MBR) and boot sector if you suspect a virus infection. There are four options:

New MBR - Insert a new generic MBR without changing the partition table.

At the prompt, type: bootrec /FixMbr

New Boot Sector - Insert a new Windows 7/Vista compatible boot sector. It will automatically insert the right type of sector for the file system type (NTFS, FAT32, etc.)

At the prompt, type: bootrec /FixBoot

Rebuild BCD - Rebuild the Boot Configuration Data (BCD). The BCD controls which partition boots. This option will let you select which installations to include in the BCD.

At the prompt, type: bootrec /RebuildBcd

Find OSes - Scan the system for all OS installations that are compatible with Vista/2008 and will also show those that are currently included in the BCD.

At the prompt, type: bootrec /ScanOs

3. Check Hard Disk and Cables

If you had changed, added or removed hard drives, or changed or removed drive cabling, likely something is wrong. Recheck that the drives are properly installed and the cabling has not changed. Switching cables to different motherboard connectors or changing the master/slave drive jumpers (on old ATA drives) can cause this problem. In some systems, the cables were not plugged into the drive or motherboard securely and may have worked loose. Reseat all drive connectors.

It's also possible a hard drive is failing. Use a system diagnostic to validate the drive or swap to another hard disk.

 

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