Win XP Mouse problems

I just installed win xp pro on my computer and i keep loseing my mouse pointer. At any given time with no consitency it will just disapear and some of the colors get distorted. I have a PIII 600Mhz 256MB Ram and an NVIDA TNT2 64Pro. I have downloaded the newest detonator drivers and even the drivers microsoft recomended in the windows update, nothing has helped. Any help on this would be greatly appreciated.