Erratic mouse mouvement

A couple days ago my DELL latitude started having a strange behavior.
Every now and then the cursor starts jumping all around the places and clicking (left and right click) randomly. I am using the touchpad as of now. IT did not behave like this before.
I updgraded and rolled back the mouse drivers with no results. I scanned my laptop with anti spyware and anti virus soft (AVG, SPybot and Lava soft).
This still happens.
Any idea?

THanks