Hi, couple of questions
where did you get the drivers from and why did you need to roll back as you have only said it would not update?
if you have a geforce graphics card it is easiest to go straight to
www.nvidia.com and for ATI -
http://ati.amd.com/support/driver.html
one thing often missed is updating DirectX which can be obtained directly from microsoft, depending on what your fault is it may also be worth removing the graphics card and reseating it as they can often work slightly loose causing random crashes.