Photoshop Elements :: Cursor Jumps To Random Positions In 8

I use Adobe Photoshop Elements Version 8.0, and I use Windows 7.
 
The problem: Whenever I use any tools involving the usage of the mouse on the canvas, everytime I click to use the tool, sometimes the cursor seems to 'jump' out of position and I end up unintentionally putting paint on the wrong part of the canvas. And before I release the click, I try to move the mouse around in random directions to no avail; the mouse doesn't respond until I release the mouse. In another similar case, sometimes for a split second the cursor seems to move on its own and it leaves behind a random trail of color. Example: Let's say I wrote down my name 'Andrew' on the canvas. I end up something similar to 'Anc e.", along with a black dot/calligraphic stroke or two unintentionally placed when writing down my name. I had to undo and click several times until I properly got the tool working. I'm working on a certain project in PS
 
I'm guessing a part of my bare hand is just barely in physical contact with the touchpad?