You fond with ball mouses by any chance?
'tis called a trackball. It's really useful if you're using a surface not meant for an optical mouse (i.e. couch arms, bed pillows, etc.)
Either way for a solution under $75 that doesn't overwhelm anyone I'd personally recommend the Razer DeathAdder.
@Beachbum: Restore your computer back to default? Make sure you have your important files backed up.
That's a terrible method. There are plenty of ways to fix his computer without making any hasty decisions.
CCleaner being one of the methods to fix registry issues, and clean up stuff left over from other programs.
msconfig for disabling services and startup programs he doesn't use or need.
Please lern2 before giving bullstuff answers, kthx.