Optical mouse problem

I have a Microsoft Intellimouse Optical. Now, on the other one I have, when you lift the mouse off of a surface, it automatically shuts off. But, this mouse instead decides to freak out and the cursor goes all over the place. Really sucks as it screws up in games. All the latest drivers are installed, and I've tried it on PS/2 and USB. Anyone know what's up?

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"There's more to life than profits."
<font color=red>"Like what?"</font color=red>
"Like, you know, Slurpees and stuff."
<A HREF="http://images.southparkstudios.com/media/video/707/slurpees.mov" target="_new">South Park</A>

I checked before, and didn't see anything. But, I just checked again and there was a hair kicking it right over the lense. Cleaned it off, now it seems to turn off and not freak out anymore. Thanks!

--
"There's more to life than profits."
<font color=red>"Like what?"</font color=red>
"Like, you know, Slurpees and stuff."
<A HREF="http://images.southparkstudios.com/media/video/707/slurpees.mov" target="_new">South Park</A>