Eratic mouse pad and usb mouse on xp Toshiba laptop

Hi, I have been given a Toshiba, laptop, xp pro, with a serious mouse problem. Its movements are erratic and move all over or get stuck in corner, then suddenly it will work for a half hour, then will freeze in a corner. The mouse pad is the same. I have changed mouses, I have tried the mice on different computers and they work. I have reformatted 3 times. If i try to disable the mouse pad, then the usb mouse will not work at all, but the mouse pad will, though not well and still gets stuck. So i must enable it as i get a little more action with them both enabled. I have done a few virus scans, came up with nothing. Hope you can help me to fix this laptop, because then i need to ask for help to get my PC running again, as i cannot get windows to fully load. ..but one problem at a time... my mouse problem... :) thanks

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows XP Professional, Service Pack 3, 32 bit
Processor: Intel(R) Pentium(R) M processor 2.00GHz, x86 Family 6 Model 13 Stepping 8
Processor Count: 1
RAM: 1022 Mb
Graphics Card: ATI MOBILITY RADEON X600, 64 Mb
Hard Drives: C: Total - 57223 MB, Free - 46851 MB; E: Total - 2384654 MB, Free - 510897 MB;
Motherboard: TOSHIBA, EAT10/EAT20
Antivirus: Spybot Search and Destroy