Nvidia 9500 gt and cod2 fps problems

Hello,
I am using NVIDIA 9500 GT GeForce..playing cod2/4 with it...eversince i had it i was running cod2 with maximum fps..even could reach maximum of 1000@cod2,cod4 gave good preformance with 600 fps max...and now when i reinstalled my winXP...instaled drivers etc..cod4 works same agin but cod2 game dosnt give me more than 100 fps,i reinstaled game few times..even drivers of graphic card..reinstaled dx7 files to..nothing helps

I have AMd Athlon 64x dual core procesor 3600+ 2.1 Ghz, 1GB rams and NVIDIA 9500 GT