of course, if it's the windows being stalled completely due to hardware issues, the "mouse being stalled" will only be a symptom, and the issue is on the computer.
if it's a desktop, check out if you have too much dust inside your box. open and vaccum the box, check if ventilation is working ok, nothing overheating etc ...
Try booting with a live CD such as Knoppix and see if the behavior changes. If the mouse works you will know it isn't a hardware problem with your mouse.
Connect the mouse to another computer and see if the problem follows the mouse.
Also, if it's a USB mouse try a different port.
William Fulks
Are you using it on a shiny or glass surface? I've seen optical mice do this on glossy or glass top desks because it reflects the light and screws with the operation. Try getting a few pieces of paper to use as a makeshift pad and see if it works any better.
rbudj
Make sure there is no obstructions in the optical area such as a hair
if it's a desktop, check out if you have too much dust inside your box. open and vaccum the box, check if ventilation is working ok, nothing overheating etc ...