Im pretty sure i already posted this in the thread, but as lots of people just skip to the last page might as well repeat myself.
the issue is caused by sensitivity in the touchpad.You can try turning the sensitivity down but that doesnt always work so the best solution is to :
Just install touchfreeze. Its a free program that automatically disables the touchpad when you start typing and then re-enables when you stop. heres link explaining the Cursor Jumping issue and it contains a link to the free program touchfreeze
Enjoy