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!
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!!!