What do you have for a power supply? It needs to be at least a 300 Watt, and a good quality one. That's one of the most power thirsty setups you can build.
Are you overclocking at all? The CPU that is.
It has been common for AH to be THE toughest app you run. Many folks have fixed their problems with a new power supply, or by turning their OC down a notch. Even when other games work OK, it doesn't necessarily mean that AH itself is the culprit.
Failing that, the junky 56K Winmodem could be a spoiler.
Are you sharing any resources or IRQ's? What slots are your PCI/AGP devices in? Are there two PCI devices in the last two slots?
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Lephturn - Chief Trainer
A member of The Flying Pigs
http://www.flyingpigs.com "My P-47 is a pretty good ship, she took a round coming 'cross the Channel last trip.
Just thinking 'bout my baby and lettin' her rip, always got me through so far."
- Steve Earl