In today's (unusually late) DOOM 3 newsbit, a post on
PlanetDOOM confirms from
Activision that DOOM 3 will not run under Windows 98 or Win98SE, but that
Windows XP or Windows 2000 will be required.
or just use cd keygen. generate corp key, and then you dont have the product calling home, and you can change as much hardware as you want, and it wont stop working either.