utilpds

Display Driver Uninstaller is a driver removal utility that can help you completely uninstall AMD/NVIDIA graphics card drivers and packages from your system, without leaving leftovers behind (including registry keys, folders and files, driver store). 

The AMD/NVIDIA video drivers can normally be uninstalled from the Windows Control panel, this driver uninstaller program was designed to be used in cases where the standard driver uninstall fails, or anyway when you need to thoroughly delete NVIDIA and ATI video card drivers. This software is backed by Guru3D.com The current effect after you use this driver removal tool will be similar as if its the first time you install a new driver just like a fresh, clean install of Windows. As with any tool of this kind, we recommend creating a new system restore point before using it, so that you can revert your system at any time if you run into problems. 

If you have problem installing older driver or newer one, give it a try as there are some reports that it fix thoses problems. DDU is an application that is programmed by Ghislain Harvey aka Wagnard in our forums, Guru3D.com is the official download partner for this handy application.

We have an extensive AMD support thread over here and an NVIDIA over here