Go to YOU,update driver only,go into terminal as root type "init 3"
when into this get into root mode and type "sax2 -m o=nvidia" 0 is number not letter
when you get into sax2,edit config, go to 3d thingy and enable 3d and save
It should load up with nvidia logo before desktop loads
hope all works sorry its pretty vague but its pretty self explanatry