same thing happened to me, I didn't fly it for a while, it used to run good with Win8.1, now it's all messed up! Nvidia gtx460, win 8.1 etc... COD hates my new win 8.1 re-install.
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ASUS P8Z68 V Pro Gen3
Intel i53570K 3.40 GHZ
G.Skill F3-17000CL9-8GBXM
EVGA Nvidia GTX 680 Video Graphics ard
WD Black WD1002FAAEX 1TB
Cooler Master HAF 922
Corsair Enthusiast Series TX650 V2 650W
46" Samsung LCD HDTV
Win8 x64
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