Return to a previous video driver

Hi, sorry for my english I’m learning :shame:

I installed OpenSuse 11.1 x86_64 in my computer having some problems with my Ati HD 3200 graphic card. Especify with 3D Aceleration then I search in google and some forums and follow some instructions to install ATI drivers.
At the first I installed a driver but didn’t work for me I could see the image but it seems going frame by frame very slowly. I searched again and followed other instruction, download the ATI driver from ATI’s web page (the last one was from OpenSuse ATI One click Install) then I installed these new drivers and now I can’t see anything the screen is black (normal and safe mode). Now I want to return to the original driver it doesn’t matter if it haven’t 3D aceleration but it worked ok :’( But I don’t know how to do it, I’m a beginner linux User.
I really apreciate your help thanks