I just recently replaced my 16G hard drive and G-force4 128 card with a bigger drive and Radeon 9600pro 128.
Had 756 333 ram and upgraded to 1G ram.
on both systyms.
My old hard drive was so full I couldn't defrag, and hadn't for about a year.
Had absolutely no problems running AH2 other than the occasional studder.
Having no problems with new systym other than Radeon does have lower fps than G-force.
Running at 1080 x 1024 --512 texture-- max 60 fps. monitor refresh at 75. on both systyms.
What I have always done and still do before logging on is make sure printer is turned off , virus and firewall turned off and exit anything in my systym tray.