go into windows own mouse control and uncheck enhance pointer precision.http://www.hardcoreware.net/files/mouse_fix.reg
you can also download and run this. it changes some reg values that disable acceleration completely.
seems to work with any mouse. make sure you reboot after you apply this fix.
you may also want to back up any reg values you change.http://blacklight-forum.perfectworld.com/showthread.php?t=324921
check out this article...