Last week one of my clients called me regarding a problem on his personal laptop, he said it would not boot into Windows because it was returning an error message. After gathering more details from him it turned out he was running Windows 7 and it was returning a bootmgr is compressed error.
This was a new issue for me so I proceeded with typical troubleshooting steps by asking him a slew of questions to gather more information.
How do you think it happened? Did you see any error messages before the issue occurred? Was Windows 7 running ok before the error? After these and a few other questions the puzzle started to come together pretty quickly.
He pretty much responded by saying Windows 7 was running absolutely flawless for at least 3 months since he performed an upgrade installation to Windows 7 from Windows XP. However he then proceeded to tell me that he has been receiving messages on screen stating that his disk is near capacity, etc. for at least a week.
Hmm, could he have compressed his hard drive willingly or unwillingly possibly causing this bootmgr is compressed error? I proceeded to ask him if he remembers compressing his drive and to my surprise he said no. On the other hand end-users come to computer technicians like me for a reason so I was a bit skeptical to his response, plus I have seen before during the course of my career where a person compressed their drive or files unknowingly.
Regardless of my thoughts and experiences this was still a new issue to me but at least now I had something to go by so I was ready to start Googling for an answer. After I performed a bit of online research I discovered that my original hypothesis was a potential right on the money cause of the bootmgr is compressed error. Hmm, could I have been correct?
After I was able to get laptop in hand I immediately proceeded to boot from my Windows 7 repair disc to work with the Windows 7 system recovery option tools. I started by using the Startup repair option to no prevail. Startup repair is a great first step for troubleshooting Windows 7 startup issues but it didn’t do anything in this case.
After that failed I booted from my system repair disc again and clicked the load drivers button to open the explorer type window to check if the drive was compressed. Ahhhh, sure enough his drive was compressed. I unchecked “Compress this Drive” and rebooted, but the error still occurred.
Booting for a third time from my Windows 7 system repair disc I launched the command prompt system recovery tool. I then proceeded to write a new boot sector to the system partition and repair the boot disk’s master boot record by executing the following commands in order hitting enter after each one:
- Bootrec /fixboot
- Bootrec /fixmbr
Voila! After rebooting the computer Windows 7 launched successfully.
This was my first experience diagnosing a startup issue with Windows 7 since its release and it turned out to be a very interesting one indeed. If you want to learn more about troubleshooting bootmgr startup issues in Windows 7 and Windows Vista check out my new page that I’ve written in direct response to this experience.
Here’s the link: How to Fix Bootmgr is Missing and Bootmgr is Compressed startup errors.