FPS lag?!

Alrite so today I did a Factory Restore on my computer cuz i somehow got a rootkit/virus. After I installed all of my programs I saw that I somehow got a decrease in fps and I cant shoot as well as I did b4. Usually I get 50-70 fps on all high settings, but now im barely getting 30-40 fps on the lowest setting wdf? Is there anything at all I can do to fix this, or do I just need to get used to the drop in Fps.

Specs:

Windows Vista Home Premium SP2

2 GB of Ram

Nvidia GeForce 6150Se nForce 430

AMD Athlon 64 X2 Dual Core Processor 4200+ ~ 2.2 Ghz

Is it my computer or Crossfire that is making this lag happen? Any help is appreciated!

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