Server 2003 screw up!!

HELP!!! I screwed up big time guys/gals, Someone has been screwing with the server I have been working on, (2003 with active directory domain, 40 systems) I disabled every account in 2k3 while checking for unauthorized access and got locked out. I disabled every account, administrator, everything. I didnt just change the password, I disabled them. Is there any hope? Any ideas about what I can do?
Serious help needed folks!
THX.
Kalapper