As minimum requirements...
Maybe I'm just lucky, but I only have a Pentium III, 600 Mhz. AND... 8 (!) MB VRAM, ATI RAGE Mobility P AGPx2 Card.
Also I use a 18MB HDD and 384 MB ram.
Dont know if there are any issues with the nvidia riva tnt2 32mb card.
Why not try the Personal Lerning Edition, which is a free download from A|W's website?
Here I tried some lame sittting-by-the-pc-comedy... but the hdd is of course 18 GB
I do not support Bush! Nor Saddam! Long live UN!