Do you have a static IP address ... If this is a virus they could have an auto reload so the anti-virus scan wouldn't be enough. Surprisingly MS's built in system security is pretty good so turn that on and put at a higher level security (you can look up the process on Microsoft's site). If that doesn't work look up diagnostics for your graphics card and run that. Good luck!

Boni

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"Be Hero to Yourself" -- Peter Tork