hey mate have you checked out www.laptopvideo2go.com
Have a look there and read up on their part and how they can help you...
Basically you download the driver you want, plus the inf file..then extract the driver into a folder and replace the inf.
However, personally I've been using GeforceTony's nvidia drivers and there is no messing around required...just download the setup.exe for whatever driver you want (i'm using his latest release with the 83.60's...great performance and image quality).
Find the 83.60 download and info here: http://www.notebookforums.com/showthread.php?t=134108
For correct procedure on uninstalling current drivers and updating have a look here: http://www.notebookforums.com/forums...d.php?t=125152