I have a small domain controlled by a 2003 DC. I have replaced an old XP machine with a new W7. I was able to join both PCs to the domain. Later, I discovered that I could not RDP to either PC- recieved a message that the primary trust had failed. I can log onto the PCs as the domain users and with the local administrator account but get access denied when I try to log on locally as the domain admin. I can rename the PCs on the domain but cannot remove them from it. I have reset the computer accounts in active directory with no change and then deleted and later re-created them in the A/D console- still no change. Netdom gives me access denied and I get the same thing if I try to manage the PCs from teh DC's console.
I realize that's a lot of info- but I've been at this for a couple of days. Let me know if any clarification is needed.