I do want to Congratule you to the UPSTEP in PC life - LINUX -
There are many different ways to update your NVIDIA driver, the easiest that I tested was :
On page 1 of this thread Rob C. posted a very EASY to follow, Understand and working way of doing the Upgrade.
PRINT this post before you start - YOU WILL NEED IT.
If ther's anyprobs send a message or mail.