I have a ATI x1600 graphics card and are now using Ubuntu 10.10, where can I find the correct drivers for it so it works correctly?

I have a ATI x1600 graphics card and are now using Ubuntu 10.10, where can I find the correct drivers for it so it works correctly? I've tried to goto ATI's website, but when I download the legacy drivers, it says it can't open them. I get this when I try:
Could not open the file /home/matthew/Downloads/…er-9-3-x86.x86_64 (1).run.
gedit has not been able to detect the character encoding.
Please check that you are not trying to open a binary file.
Select a character encoding from the menu and try again.

the whole file is called: ati-driver-installer-9-3-x86.86_64(1).run
I have installed additional drivers (jockey-kde) and (jockey-gtk) for it, but I don't think its what I need.

Anyways, I think its slowing my pc down right now without the correct drivers. I am new to linux and ubuntu, and I'm also doing this so that I can run world of warcraft on my pc. I have a 2.4g P4 processor with 1g Ram, The graphics card is ATI radeon x1600 sapphire AGP 512mb. World of warcraft is currently unplayable right now since its not utilizing the graphics card correctly. I also tried to use the additional drivers function, but it did not detect any proprietary hardware/software on my pc. Any and all help to get this resolved would be much appreciated.