Does anybody else out there have a problem with "haunted cursors" in Windows XP pro? Every few minutes (so it seems) my stoopid cursor migrates up or down without me moving the mouse. It's annoying!
When that happens to me it's usually because Cartman is sleeping on the mousepad.
Do you have another mouse you could plug in to see if it's hardware related? And sometimes I've seen that with optical mice on certain surfaces...you could try skipping the mouse pad or using a different one for a bit.