Hi,
Could it be because of viruses?
Try to run a complete system virus scan and malware scan to check for any viruses or malware causing this behavior.
or the issue might be related to the drivers. You could try to download and install the latest display and graphics drivers to fix the issue.
well,anyway,i found this site..Maybe it could help you..
http://social.answers.microsoft.com/...c-8a967b95409d
if cannot, just go any PC repairing shop and ask for the pro..