Category Archives: Stuff I wrote when I was in to Microsoft Windows

The name says it all

"BOOTMGR is compressed" error message

This post tells you how to fix a compressed BOOTMGR file. This is for Windows Vista & Windows 7 only

What Happened
I was cleaning out my C drive, when I was done I only had 4 GB left, (better than 2 GB but still not that good) so I right clicked on my C drive then clicked properties and clicked the checkbox that said  “Compress this drive to save disk space”. So I clicked apply. It was going to take 4 hours so I cancelled it. Later on I needed to restart my computer, It shut down but when it turned back on it said “BOOTMGR is compressed press CTRL + ALT + DEL to restart”… Oh Dear!
The Fix

I got the cd that I used to install Windows and put it in the CD drive and turned on my computer. I pressed a key when it said “Press any key to boot from CD/DVD”. When it was done loading I clicked next.

  Then I clicked Repair Your Computer” and then clicked “Command Prompt”

In the command prompt window I typed “C:” and pressed enter.
Then “bootrec /FixMbr” and pressed enter.
Then “bootrec /FixBoot” and pressed enter.
Then “bootrec /rebuildBCD” and pressed enter.
I typed “exit” and pressed enter.

I clicked “Restart” and my computer booted just fine!


It is not recommended to compress any of your hard drives as it can slow your computer down and corrupt your drive and if it did that you would lose all your files. You can also get the “BOOTMGR is compressed” error message. If this is why you’re here, after completing the steps above click start > computer, right click “Local Disk C:” and UNCHECK “Compress this drive to save disk space” click apply and DO NOT cancel!!!

How To Remove A Bootsector Virus


The other day a friend dropped her computer off to get us to fix some of her problems (BSOD, Viruses, etc). When I powered it up, the virus she said was on there, was not there. Still I removed AVG and installed Avast antivirus.

What Happened

Avast displayed a message saying that we had a virus that attached itself to the boot sector and asked if we wanted Avast to remove it. I clicked yes and I got told that to do this I must restart the computer, so I did that and the Windows Vista boot diagnostic came up (this was not meant to happen) and tried to fix the problem and restarted itself, the boot diagnostic came up again! and it just went into a loop

The Fix
I downloaded the Windows Vista recovery disk (64bit Download*, 32bit Download**) I unzipped the zip file and burnt the iso image to a CD. I put the CD into the computer, rebooted it and pressed a key when it said “press any key to boot from CD or DVD”, waited for it to boot then clicked next (don’t worry this will not wipe your computer or reinstall vista). Now click “Repair Your Computer” or press “R” on the keyboard wait for it to find your vista installation and click Next. Now click Command Prompt.
Now I type (into command prompt) “bcdedit /export C:\bcd_backup” and press enter.
Now we want to move to the directory “C:\boot” to do that type “cd C:\boot” and press enter.
Next you need to type “attrib bcd -s -h -r” and press enter.
Now we need to rename the bcd (just so we have a backup copy). Type “ren C:\boot\bcd bcd.old” and hit enter.
We can’t leave it like that as you would have no BCD! Now type “bootrec /RebuildBcd” and hit enter and type Y when it says “Add installation to boot list?”.
Close command prompt by typing “exit” and pressing enter or by clicking the X
Now press “Restart” and your computer should boot correctly!
* Download link from
** Download link from

Some of the steps are from this video