Windows 7 FEAR Installs, Runs, and locks frames at <20!

Ok.. So I play F.E.A.R. from time to time online.. My issue is that although install is sweet, it starts up and runs fine for about 1-2 minutes. Until it randomly drops my frames to something like 11-12 fps and sticks there. Nothing fixes it. Build 7100. All latest drivers, updates, etc. Re-install doesn't fix. I r confused!

Running AM3 720 @ 3.0 ghz, HD4870 1GB and 4GB of DDR2 Ram. So clearly it's not an issue with my hardware (in terms of performance), as Left 4 Dead gives me 50-200 frames depending on the situation o_O. Any help pleaseee!

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