Install Win2000 on a Compaq Armarda 366, what a nightmare getting the internal modem on the right memory addresses so as to not cause conflicts with the bios. Also have a Xircom Realport 10/100 in it. Had a heck of a time getting it on the domain. Seemed to be all memory address issues.
Took a week, but finally have it running and functional. Seems very stable so far.