Time for another newb question.

Once I identified the video card - its a Radeon 7000, I then went to install the driver for it from ATI.
Once I restarted I had a split screen. Now, I have a horizontal switch on the monitor and adjusted that, but it still wouldn't fully come around. When the computer starts up before windows kicks in it is full screen.
Tried to reinstall and got the same problem.
I'm hoping that someone has some advice so I can return to gaming nirvana.