I also have the same problem...
First PC then laptop(external mouse).
With a ball mouse and a laser mouse or how they are called.
By the way they are not wireless...
What i did with the ball mouse:
Took a toothpick and then cleaned with the toothpick the left click...
It didnt do too much but...
By the way, i didnt do this with the "laser" mouse...
/ 
ve the same problem...
