Easiest method below.
D/L Driver Cleaner Pro and install
http://www.filepedia.com/desktop_sof...leaner_pro.cfm
1) R/Click My Computer
2) Select Manage> Device Manager
3) Expand Display Adapter> R/Click NVIDIA GeForce xxxx/ATI Radeon xxxx
4) Select Uninstall> Confirm Device Removal> OK
5) Restart Computer
6) Enter Safe Mode..Tap F8 during Post
7) Once in Safe Mode> Run Driver Cleaner Pro> Select nVidia (not nForceChipset/For ATI select ATI, ATI CCC, ATI WMD)> start Cleaning
8) Do step 7 Twice
9) Restart Computer> Cancel out of New Found Hardware Wizard
10) Navigate to the Location of your Drivers and Install.