Try change your settings the link below might help I am guessing you are a pretty heavy gamer some games will change your settings.
http://www.gnutellaforums.com/showth...threadid=39600
AMD 64 X2 3800+ O.C. 2.6Gh/z
Asus A8V Deluxe
eVga Nvidia 6200
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2 X Corsair TWINX1024-3200XLPRO