Originally Posted by Kage
Read the post. It's not the mouse
I guess I missed that part.
This is kind of a guess here, but do you possibly have ClickLock turned on? I looked around in my mouse settings (I just have a basic mouse too, no special drives) and that's really the only thing I could find (other than sensitivity and stuff, buy you said you turned that down and it didn't have any effect). It doesn't really sound quite like whats happening, except maybe the hold time is really short and its causing you to accidentally drag things, but that wouldn't explain the multiple clicking.
Since it's not a problem with the mouse, I'm not really sure what else could cause that. Very strange problem...