chumly :
Some of the components of a driver install cannot be removed without you going to look for them, or having a program to do it for you. There is a nice little program and guide to do all of that here:
http://www.guru3d.com/content_page/guru3d_driver_sweeper.html
Do a clean sweep of all your drivers and start from scratch.
Doing this has given me more trouble. When I first installed my graphics card, about a month ago, installing the drivers caused the screen to go blank at the login screen. Now after uninstalling with driver sweeper and reinstalling drivers the same thing is occuring.
I managed to overcome this problem in the past by installing drivers on the disk through device manager. Unfortunately this doesn't seem to be working for me.
The funny thing is when I was installing drifferent drivers to try and fix the Physx problem, sometimes windows would automatically install the correct drivers (but not physx). Now when windows tries to install the correct driver through windows udpate it results in the blank screen at login.
My advice for Kypav do not attempt anything and wait for the next driver update.