Cant logon locally or onto AD

I only have an administrator account on a server that used to be joined to a win2k active directory domain controller. I did something wrong and now its no longer a member of the domain and I can’t logon locally because the policies of the local box won’t allow me too. Esentially I can’t figure out a way to log on at all to fix this. Any ideas? Is there a way to make that machine a member of the AD domain remotely?