Keyboard acting weird!

Hi there,

I recently changed Hard Drives and installed Windows XP. Ever since that, my keyboard is acting really weird...Everytime i write something (on text editor, on the web,....) the cursor jumps from one location to another by itself (without me clicking on the new location), and it is REALLY annoying!!

I believe it is has to do with the driver (I haven't installed one for theleyboard when i formatted the HD), though I might be wrong...