Pardon my insulant American attitude up front, but I could probably send you a faster PC machine that is nicer after a trip to the local recycle center. Why try to run UAE on a very OLD PC.. You won't like the performance.. UAE on my 400 Mhz Pocket PC takes at least 1-2 minutes of black screen just to go to a normal Amiga boot screen.. I suggest when possible you upgrade your motherboard. I owned a Rage 128 graphics card back in... OH... 1996 and I also had all of ATI's developer info on the card. That card wasn't really designed for anything probably above directX 6-7 functionality (I remember using direct X 1-3 on mine).
I think you need to fish thru old ati brand drivers to find one that includes OPEN GL support. Today (well even on Windows 2000) it would be considered a LEGACY card and probably the driver included on windows doesn't even have OPEN GL supported on it anymore.. The VIA chipset is probably another legacy issue for it. Find the maker of your motherboard and make sure that you have the proper windows drivers for that via chipset motherboard.
Considering that Pocket UAE takes a few minutes to come up on a 400 megahertz Pocket PC today, yours will probably do the same but should run okay when the screen boots up.
My advice, go out for coffee before you turn it on and don't turn it off.. You probably would do better trying a way OLDER version of WINUAE (one that doesn't use the Virtual Machine for emulation) (like something before version 8.x)
