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?

Edit:
Here I tried some lame sittting-by-the-pc-comedy... but the hdd is of course 18 GB