I transposed "former" and "latter", sorry to confuse

corrected now.
Looks like the same Admin Password Reset option is on a boot CD (mine's a floppy disk - old technology) so that should get you in.
Would you believe I was MSCE trained on 2K Advanced Server but without practice, have forgotten most of it? ... otherwise I'd give you recovery steps to take. It's still possible but I don't want to start you on something I can't finish!
A Domain is just a network for clients authorised and run by servers. A workgroup is a network that does not need servers. Perhaps that is the problem when you take it away from the work domain?