mouse movement causes fps loss?

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Capt.Toilet

Good news everyone!
Feb 16, 2004
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Ottawa, KS
Running Unreal 2 on Vista 64 bit w/ SP1

Specs

AMD phenom x4 9150e quad core @ 1.8ghz
7 gigs pc5200 ram
geforce 8800gt 512 meg w/ latest drivers
Razer dethadder mouse w/ up to date drivers

Not sure what is causing this(though i am inclined to blame Vista). Basically when I move my mouse my fps will get cut in half, and when I am in an area that yields low fps to begin with it can become quite annoying. Vsync and AA are off by default through the card. Mouse smoothing has been turned off. I have tried lowering resolution and details, but fps stays the same oddly enough and the mouse issue still continues.

Really not sure what else I could try out. Oh and U2 is the only game this happens in.