It sounds like your videocard drivers were uninstalled for some reason. You need to download the drivers for your videocard and reinstall them. Another possible screw up is if your videocard isn't the default video selected, but usually the only way to fix this is to reinstall the drivers. Try that! When videocard drivers aren't installed, you can't scroll at all due to the screen lag and you certainly won't be able to play any videogames.
-Lasereth
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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