BOOTMGR short for boot manager is a file that Windows uses to launch your computer.
The Boot manager file should never be compressed for your computer to start automatically.
If your computer presents a
‘BOOTMGR is compressed
Press Ctrl+Alt+Del to restart’ screen upon the booting process, it is a clear indication that the BOOTMGR file of your computer has compressed.
However, there is no need to fret. Because there are a couple of solutions that you can use to fix this error and get back into your operating system.
So keep reading to learn all the solutions you can use to fix the “BOOTMGR is compressed” error.
Reasons for the error
The fatal ‘BOOTMGR is compressed’ error restraining you from accessing any of the operating systems installed in your computer is caused by one of these two reasons.
Often, a virus or some other suspicious malware compresses the boot manager file.
The other reason is that the boot manager file gets accidentally compressed to decrease the size of the file and increase the storage space.
This unintended action leads to the boot manager file being corrupted.
If the BOOTMGR of your Windows is also compressed, then one of these two reasons might definitely be the cause of igniting the mishap.
There are a couple of solutions you can follow to fix the ‘BOOTMGR is compressed’ error.
SOLUTION #1
Step 1. Insert the ‘Windows’ disc in your CD ROM and turn on your computer.
Step 2. Continuously press the boot menu key (ESC or F12 – you can Google the boot menu key of your brand) until it takes you to the boot menu.
Step 3. Select the DVD option on the boot menu.
Step 4. Press any random key on your keyboard and wait for the loading process to be over.
Step 5. After the loading is done, click on ‘NEXT’.
Step 6. Now click on repair your computer.
Step 7. Patiently wait through the loading process.
Step 8. Press this shortcut key on your keyboard – “Shift+F10”, this shortcut key will take you to MS-DOS.
Step 9. Type the following commands in MS-DOS.
- BOOTREC/FIXMBR
- BOOTREC/FIXBOOT
- BOOTREC/REBUILD CD
Please press ‘enter’ after typing each command.
Step 10. Now close MS-DOS and reboot your computer. The computer will reboot normally.
Solution #2
You can always manually replace the compressed version of BOOTMGR with a working one.
Follow the step-by-step method given below to replace BOOTMGR manually.
Step 1. Insert the Windows installation disc into your CD ROM.
Step 2. Go to the boot menu.
Step 3. Continuously press the boot menu key (ESC or F12 – you can Google the boot menu key of your brand) until it takes you to the boot menu.
Step 3. Select the DVD option on the boot menu.
Step 4. Press any random key on your keyboard and wait for the loading process to be over.
Step 5. After the loading is done, click on ‘NEXT’.
Step 6. Now click on repair your computer.
Step 7. Patiently wait through the loading process.
Step 8. Press this shortcut key on your keyboard.
Shift+F10 – This shortcut key will take you to MS-DOS (command prompt.)
Step 9. Type this command and hit enter – bcdboot C: \Windows /s :D\
Step 10. Reboot your computer, and it will start working normally.
SOLUTION #3
The BOOTMGR error is often caused by compression of data to save the hard disk story.
You can disable the automatic compression of files feature and fix this error by following the method given below.
Step 1. Insert the Windows installation disc into your CD ROM.
Step 2. Go to the boot menu by the method given in the next step.
Step 3. Continuously press the boot menu key (ESC or F12 – you can Google the boot menu key of your brand) until it takes you to the boot menu.
Step 3. Select the DVD option on the boot menu.
Step 4. Press any random key on your keyboard and wait for the loading process to be over.
Step 5. After the loading is done, click on ‘NEXT’.
Step 6. Now click on repair your computer.
Step 7. Patiently wait through the loading process.
Step 9. Select the operating system.
Step 9. Click on ‘load drives.’
Step 10. Select the boot drive.
Step 11. Right-click on the boot drive and select properties and then go to advanced.
Step 12. Unselect ‘ Compress this drive to save space.’
Step 13. Reboot your computer and the error will be fixed.
SOLUTION #4
In Windows, a default startup repair function can also be used to uncompress the BOOTMGR file and fix the error.
Use this method to take advantage of the startup repair feature.
Step 1. Insert the Windows installation disc into your CD ROM.
Step 2. Fully turn off your PC.
Step 3. Turn on your PC.
Step 4. Go to the boot menu by the method given in the next step.
Step 5. Continuously press the boot menu key (ESC or F12 – you can Google the boot menu key of your brand) until it takes you to the boot menu.
Step 6. Select the DVD option on the boot menu.
Step 7. Press any random key on your keyboard and wait for the loading process to be over.
Step 8. After the loading is done, click on ‘NEXT’.
Step 9. Now click on repair your computer.
Step 10. Startup repair will scan your PC, then select the install from the list.
Step 11. Click on startup repair.
Step 12. The startup repair will scan your whole PC and repair all the bugs.
You can use any one of the four solutions to fix the ‘BOOTMGR is compressed’ error of your computer.
If one solution does not work, try the other one until the error gets fixed.
CONCLUSION
The ‘BOOTMGR is compressed’ error is caused by the compression of the BOOTMGR file automatically or by a virus. The common boot error is quite fatal as it restricts you from logging into the operating systems installed on your computer.
However, you can fix this error on your computer and still log in to your Windows without losing any files by some of the methods given below.
Remember to follow the next in case of the failure of the first one.