Mouse clicking and scrolling on its own

Is there any reason why my laptop's pointer sometimes just click and scrolls on its own? Most of the time it doesnt, but sometimes, if my pointer is on a button (close, submit, etc), it automatically clicks it. i am sure that there is nothing pressing the left mouse buttons (the built in ones and the actual mouse i sometimes use) when it happens, so what is going on? the only things in the mouse setting that i have changed is the speed of the pointer, not the double-click speed or anything else.

yes, all 3 mice do that unfortunately. now its also dragging stuff at random, like links, and highlighting text im scanning for viruses right now, but i doubt anything will be found

"Windows Resource Protection did not find any integrity violations."

This started happening a few days after i changed the pointer speed, but then again, Ive only had this laptop for about a week and yes, i have restarted my laptop a few times aready

Would this be a clue?

"Windows 7 Enterprise"

Someone interfering/messing with your pc on a hidden remote connection.