|Can you do a System Restore to a time before the message popped up ?|
You can also run System Restore from a Command Prompt if you are unable to boot to Windows.
Press F8 just after BIOS post messages and choose Command Prompt. Type in
If your Windows is installed on some other drive than C:, change C: to it.
Please note I have never used F8 method at all with Win 7 and I do not know what menu options will appear there. I assume the menu will be the same with earlier Windows versions.
Or if you have a Win 7 disk, repair your Win 7 installation.