Missing PDC

I installed both NT4 Server and Workstation on one PC for the purpose of practising for my MCSE exams. Everything appeared to be working OK. However when I tried last to open a new user account I received an error message that the PDC does not existon the computer. I don’t know what I did wrong.

My question is, can I bring back the PDC without reinstalling the whole (server) program? How can I do that?

Thanks.