Check points for fixing compressed boot-manager:
Boot into Windows Recovery Environment (WinRE) and perform a "Startup Repair".
If the above doesn't solve the problem then boot into WinRE again, but when selecting the installation, then press "Load Drivers" (Instead of "Next") and use the mini Windows Explorer to right-click the boot-drive and deselect "Compress this Drive" and choose Apply to sub-folders and files.
If that also fails then boot into WinRE again, and go to the "Command Prompt" and execute these commands:
compact /U C:\bootmgr
compact /U C:\ntldr
If you for some strange reason have lost your DVD, then you can also use a Windows 2000 / XP install CD and enter the recovery console instead and execute the following commands: