Please, post a Dxdiag report (upload it on a sie like pastebin.com and then link it here).
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Frankly, I wouldn't know what to suggest, the Dxdiag report you posted shows absolutely no error whatsoever (which is strange), whereas the error you posted in your first message EXCEPTION_ACCESS_VIOLATION seems to point at corruption in system/driver files or a HW issue like RAM sticks going bad.