Go to:
Start
Settings
Control Panel
System
Hardware
Device Manager
Mice and Other Pointing Devices (this may vary depending on configuration)
Now, Your mouse or touchpad should have an entry here (Synaptics Touchpad for example).
Double click the entry for your mouse and see if there is a 'polling interval' or similar checkbox. For the life of me I cant remember the exact title but it can cause mouse jumping, particularly on laptop touchpads. If you post back with findings Il tell you if the problem lies there or elsewhere.
By the way, does it happen f an external mouse is plugged in?
I also drink Port and I'm not ashamed to say it!
Me Truck