Well, my Intellimouse Explorer is going back to the store tomorrow. I have had the worst luck w/this piece of crap. I've got a BRAND NEW Dell 8100 and the pointer absolutely goes CRAZY--ALL over the screen!! Maybe it has something to do w/Windows ME, but I haven't had any hardware problems yet--and this is a MICROSOFT product!! I've tried everything--downloaded new drivers, tried different colored surfaces (light and dark), and tried connecting the thing in both USB and PS/2 ports. I bought the thing b/c I play a lot of FPS games and I thought it might help me out. WRONG!! Back to my trusty cordless Logitech Mouseman Wheel--I don't know what I was thinking when I bought this thing... Sorry if I'm stressing....