Weird Mouse Jamming

FYI, this isn't the 'jittery mouse' error, so don't overload me with links to the sticky.

Anyway, CF was all fine etc, and I was running an nVidia GeForce FX5200 which hadn't received a driver since 2003. The game was smooth as butter and everything was cool. However, I had to update my driver so I could run Minecraft due to the old one's limited OpenGL capabilities. Anyway, I added the latest driver for the 5200, from 2008. Ever since, my frame rate is same as before, except that my input from mouse is delayed, or my cursor jams. The enemies still move around at 60FPS, but my mouse just jams, which screws with my aim.

Any help at all here would be extremely useful!

Thanking you all in advance.

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