I run a P233 with a TNT2/M64 on W95, and cursor trouble is only when a bridge is very large, or I move the mouse while holding a key down at the same time.
(Which means I use the "shift" feature very carefully - move the mouse, stop, press shift, click, release shift, then move the mouse again). Tho that's likely a problem with my slow machine not emptying the input queue fast enough.
I am running a 12.40 series detonator; have you downloaded and installed a detonator from nvidia or are you running with W2000 default drivers?