Wow, I run that exact same card. I'm using Asus' 6.31 drivers.
Illo, first do this: Update to Direct X 7a if you have 7 or 6.1 still. (If you can't find 7a, 8a will probably be ok.) Now, switch to "standard VGA" driver, reboot, and then reinstall the 6.31 drivers.
Now, on AH startup, click video and make sure "enable z-buffer" is unchecked.
Also, in the Direct X driver properties, change mip mapping from "best image" to "high quality."
Illo, what MB do you have? It it's an Abit KT7 or kt7a, I'd try changing the AGP voltage to 3.3 rather than 3.56 volts. This has solved many problems with GF2 cards on this MB in the past.
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bloom25
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THUNDERBIRDS