Do you know anyone who does? It would help a lot with figuring out if the problem is with your mouse or with your computer.
How often does the problem happen?
When did it start? Have you tried System Restore to go back to a time before it started?
Have you tried testing the mouse in
Safe Mode? If not, try it and see what happens.
Have you tried plugging the mouse into a different USB port?
Is it wired or wireless?
Until you can test the mouse on another computer and vice-versa, we might as well explore other possibilities.