Does the issue occur when you open system build-in applications?
This issue can be caused by several reasons. I suggest you boot in Clean Boot Mode to detect if the issue is caused by any background programs.
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7
http://support.microsoft.com/kb/929135
If the issue occurs when you launch any applications, try to upgrade your BIOS and hard drive firmware.
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”