Where are the drivers?

[Ignis]

Please someone? Anyone??

I'll try and lay out what I think happened:
I downloaded this ATI Radeon thing and installed it. Not knowing what to expect, I thought it was just some other random program (it seems to have been the actual drivers all along) but it behaved strangely. For example, going into My Computer> drive C> Program files I found the ATI folders there, although one of them appeared to be curiously empty, but when I went into Start> Program files nothing ATI related could be found on the list.
Thinking it was something I was better off not having, I tried to remove the program, rebooted the computer and that's when my graphics got screwed up. I tried to reinstall the ATI thing, but that didn't seem to do anything. How do I fix this?