For anyone who believes that this could be a hardware issue, here's what's in the box:

Soyo Dragon Ultra KT333

Athlon XP 1800+

Maxtor D740x

Corsair XMS PC2700 (2X)

MSI Geforce 3 Ti 200

Lite-on CD+RW

C-Media onboard audio

Realtek onboard LAN

There are a few things running at startup: Adsubtract pro (v 5.2); Sygate pro 5.0; Ad-Aware 5.8; Ad-watch 2.5; and Norton A/V.

Thanks again,
Greg