If you don't have a reason to keep the mouse driver (buttons set up a certain way or something) just get rid of it and try that for awhile. You don't really need a mouse driver.

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Save and save often... unless your health is really low.

AMD Athlon XP 2500+ 333
ATI Radeon 9600XT
1GB PC-3200 Crucial RAM
NFORCE2 Ultra 400 Motherboard