Hi,
· When exactly you get this error message?
· Did you make any recent changes on your computer prior to the issue?
Try following the methods provided below and check if it helps:
Method 1:
Step 1:
Check if you face the similar issue in safe mode, if not you can try putting your computer in a clean boot state in normal mode and check if it works:
Start your computer in safe mode
http://windows.microsoft.com/en-US/windows-vista/Start-your-computer-in-safe-mode
Step 2:
Try following the KB article to perform clean boot:
How to troubleshoot a problem by performing a clean boot in Windows Vista and Windows 7
http://support.microsoft.com/kb/929135
Disclaimer: After you used the clean boot to resolve your problem follow Step 7 to reset the computer to start as usual.
Method 2:
I would suggest you to run the Check Disk and check if it helps.
Check your hard disk for errors
http://windows.microsoft.com/en-US/windows-vista/Check-your-hard-disk-for-errors