Friday, November 19, 2010

“bootmgr is compressed” in Windows 7

Bootmgr is Compressed???
Hi everyone,

So i was just doin some updates and stuff and left my pc alone and it restarted (as i wanted it to do) and when it booted up it said this odd message "bootmgr is Compressed"??? So i jumped online on my desktop looking everywhere and all of the solutions invole booting off a windows 7 disk, but i dont have one as my computer came with it preinstalled so i hav no idea what to do?
If anyone could help me that would be awesome as i am in a difficult situation.

The dreaded message “bootmgr is compressed” is another bugger and requires some work on your side.
I happen to run into a lot of errors in Windows 7 due to file compression. I’m not saying that it’s bugged, I’m just saying that it’s causing problems for my own setup and is even slowing it down.

Anyway, if you run into this error, your bootmgr file is probably located on another drive than your Windows 7 main partition. Thus, you are receiving the error. The bootmgr file will be written to the BIOS default HDD, but if it’s on another hard drive then it can get compressed.

So, what can we do about the error “bootmgr is compressed”?
Repair your computer

Press F8 during boot up to get a list of all start-up options. Choose “Repair your computer”:

Windows 7 Repair your computer

A list of your installed OS’s will appear:

Windows 7 System Recovery Options

Select Operating System

Method 1: Repair bootmgr via Command Prompt

Open the command prompt.

Windows 7 System Recovery Command Prompt

Next, simply enter the following command to fix your boot record:


In case your master boot record has been damaged as well, I would also run


If that doesn’t solve the problem, you can also try to run the following commands to re-create your bootmgr file. You are basically creating a temporary bootmgr file and then replacing it with the original one:

Each command has to be on a separate line:

expand bootmgr temp
attrib bootmgr -s -r -h
del bootmgr
ren temp bootmgr
attrib bootmgr -a +s +r +h

I would also recommend to uncheck the option “compress to save disk space” for each hard drive and partition. Mainly, because it can cause problems like this one and it is slowing down your PC eventually.

Method 2: Repair bootmgr via “Startup Repair”

Theoretically, Windows 7 should be able to find and fix this error. If you click on “Startup Repair” instead of Command Prompt, then Windows will scan your system for common errors and will hopefully figure out that your bootmgr is broken.

Windows 7 System Recovery Command Prompt

Check disk for errors

Another error why you are receiving the “bootmgr is missing” error after installing Windows 7, might be that your hard drive has disk errors. It is always a good idea to also run the command

chkdsk C:\ /f /r

This might take some time, depending on the size of your hard drive, but it is necessary to verify that there are no corrupted files on your disk.
Another option.
Once in the command prompt, type the following, press enter after each line:
attrib -H -R -S bootmgr

In Notepad, click File | Open
Change File of Type to All Files
Navigate to the C: Drive
Right click on bootmgr, click Properties
On the General tab, click the Advanced... button
Uncheck the Compress contents to save disk space box
Click OK
Click OK
Click Cancel
Close Notepad
In the prompt, type the following and press Enter.
attrib +H +R +S bootmgr
Close the Command Prompt
Click Restart

This avoids overwriting any proprietary MBR that may be present that gives access to the System Recovery utility.

Also works if you have a Recovery disk that doesn't include the bootrec.exe tool


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BOOTMGR Missing in Windows 7
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