Did you make any software or hardware changes on your machine prior to this issue?
Let’s follow these methods & check if it helps.
If you have any unnecessary external device connected to the machine, you may unplug them & check if the issue persists.
You may boot into ‘safemode’ and check if the issue persists. It will start Windows 7 with a limited set of files and drivers. Startup programs do not run in safe mode, and only the basic drivers needed to start Windows are installed, follow the steps
to boot the computer in safe mode with networking.
If the issue does not reoccur in safemode, you may configure the computer into clean boot and check if the issue persists. It will start Windows7 by using a minimal set of drivers and startup programs and helps to eliminate software conflicts.
Note: Please ensure that the computer is set to start as usual by following the step 7 from the article: How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows7: http://support.microsoft.com/kb/929135
Hope the information helps. Please post back and let us know.
Microsoft Answers Support Engineer
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