Hi,
Thank you for your post!
There could be an error in its registry keys that is causing the problem. I would suggest a system restore first.
To troubleshoot the issue, In case this is caused by conflict with certain third party software, let us prepare clean boot.
Clean Boot prevents software conflicts by preventing the startup items and non Microsoft services from loading. This way you can safely follow the process of elimination to check which application is causing this behavior.
Refer:
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7
http://support.microsoft.com/kb/929135
Note: Ensure that you put your computer back to normal startup mode after completing the troubleshooting steps. Steps are available in the article given above.
Regards,
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