Hey, I did a search on the subject and haven't found an answer that works for me. Basically I am dual-boxing WoW in windowed mode keeping both at almost the lowest res. After about 20 minutes of playing, both windows freeze up. And i have to restart the game. I can play for about 20 minutes again and it freezes again. My machine is up to par so i'm not sure the problem. Are there some graphics setting I should be changing?

-Phenom II X4 955 3.2G
-BFG GTX295
-6 gigs of Mem
-coolermaster v8
-other crap