Hi,
Have you recently added new software to your system?
Reboot and begin tapping F8 key at the manufacturer's logo screen
Select Last known good configuration
Press Enter
These actions might prevent an error like this from happening again:
- Download and install updates and device drivers for your computer from Windows Update.
- Scan your computer for computer viruses.
- Check your hard disk for errors.
http://msdn.microsoft.com/en-us/library/ff560177(v=VS.85).aspx
You may need to perform an in-place reinstall to repair problems with the Windows Installation to prevent similar issues in the future.