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 If you're positive that it is your video card, then you will need to reset your drivers by visiting your video card manufacturer's website and downloading a previous version.  There may also be an option to rollback your drivers, but I've never done it, so I don't know.  
 Also, it could be a pain, depending on what sort of computer you have.  If it is a laptop, you'll probably have to go hunting for previous drivers, because most card manufacturers do not directly support a fair amount of their notebook video cards.
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