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One day you press "Power" on your Windows 7 computer, and you receive the dreaded "BOOTMGR is missing or compressed, Press Ctrl+Alt+Del to restart" error message, in white text on black screen. So you hit Ctrl+Alt+Del and get the same message again and again, in an infinite and terrible loop. After rocking back and forth, you straighten up, take a deep breath and search on Google, but get dazzled by so much software and service on the market. What a frustrating day!
If this is the case, you come to the right place. In this article we would like to dissect "BOOTMGR is missing" in detail.
What is BOOTMGR is Missing in Windows?
BOOTMGR, short for Windows Boot Manager, is a small piece of software that's loaded from the volume boot code, part of the volume boot record, which helps your Windows 8, Windows 7, or Windows Vista operating system start.
The "BOOTMGR is missing" error displays shortly after the computer is turned on, immediately after the Power On Self Test (POST) is complete. Windows has only initially started to load when the BOOTMGR error message appears.
What are Causes of BOOTMGR is Missing Error?
- 1. Corrupt and misconfigured files, hard drive.
- 2. Operating system upgrade issues.
- 3. Corrupt hard drive sectors.
- 4. An outdated BIOS.
- 5. Damaged or loss hard drive interface cables.
- 6. Your computer is attempting to boot from the drive that's not properly configured, such as a non-bootable source.
How To Fix BOOTMGR Is Compressed Error Message...
There is no way to boot (start up) to Windows – pressing Ctrl+Alt+Del just restarts the computer and redisplays the same message.
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It’s a rare issue however its always relevant to share the information.
BOOTMGR refers to the Boot Manager – an important Windows system file. If it is compressed, it can’t be used.
The file must therefore be uncompressed for Windows to be able to boot up.
Note: file compression used to be a good way to save hard drive space – back in the days when hard drives were only 1 or 2 GBs in size… However, modern drives offer hundreds or thousands of GBs storage so there should be no need to compress files.
How To Fix It?
There are similar fixes for XP and Vista/7 – both require you to recreate the boot record:
*** XP
You will need to have a bootable XP installation CD available.
Log into the Recovery Console command prompt by following steps A to F
A. Insert the XP bootable installation CD into your computer (borrow the CD from a friend if you don’t have one)
B. Boot from Operating System’s bootable CD
C. As the computer starts, you are prompted to ‘Press any key to boot from CD’ – press any key on the keyboard now to start the Windows recovery process which may take a few minutes
D. When the Windows setup menu (‘Welcome to Setup’) appears, the second option is ‘To Repair a Windows Installation Using Recovery Console, Press R’ – press the ‘R’ key now to enter the recovery console
Warning: the first option is ‘To Set Up Windows XP now press Enter’ – you do not want this so do NOT press ENTER.
E. You are now asked to log into your Windows installation – this is usually number 1 (C:\Windows partition) – if so, press ’1′ then ENTER
F. You are asked for the admin password – this is usually blank so just press ENTER to continue
You should now be in the C:\Windows directory.
- Type fixmbr and press Enter. Press Y to proceed
- Type fixboot and press Enter. Press Y to proceed
- Type Exit and press Enter to restart the computer
The BOOTMGR is compressed error message should not appear and Windows should boot normally.
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*** Vista/7/8
Boot into the System Recovery Options using the preinstalled Advanced Boot Options or a Vista/7 installation/recovery DVD.
- Select ‘Startup Repair’ and wait until the repair attempt completes. If successful you can then restart the computer and Windows may boot up normally.
If the repairs fail and/or the computer does not restart into Windows normally, proceed as follows.
- Boot into the System Recovery Options again but this time select ‘Command Prompt’ instead of startup repair – this will take you to a windows command prompt.
- Type bootrec /fixmbr and press Enter. Press Y to proceed
- Type bootrec /fixboot and press Enter. Press Y to proceed
- Type bootrec /rebuildbcd and press Enter. Press Y to proceed
- Type Exit and press Enter to restart the computer.
The BOOTMGR is compressed error message should not appear and Windows should boot normally.
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If Previous Fixes Fail
This step should not be required but, if the previous fixes failed to resolve the problem, you may need to uncompress all files on the system partition manually.
- Log into the Recovery Console command prompt (XP) or the System Recovery Options \ Command Prompt (Vista/7)
- Type compact /u /a c:\*.* and press Enter. The command may take a long time (hours) to complete on a very large drive – leave until finished
The command uncompresses (/u) all files (*.*) on the c:\ drive including hidden and system files (/a).
Note: if your system drive is not c: then change the c in the command to your drive letter
- Once the command finishes uncompressing all files, type Exit and press Enter to restart the computer.
The BOOTMGR is compressed error message should not appear and Windows should boot normally.
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