Unable to unjoin a domain

Question

Hello,
we are unable to log on to a reinstalled network machine.
when we try to log on we get the following error.
Windows cannot connect to the domain, either because the domain controller is down or otherwise unavailable, or because your computer account was not found. Please try again later. If this message continues to appear, contact your system administrator
for assistance.
let met paint the picture: a defective machine was reinstalled with a sysprep, after doing so we wanted to rejoin the domain wich we were able to do. after joining the domain we found our machine in active directory and Altiris.
But when the user wanted to log into the network he was unable to do so (look above warning mentioned)
i tried to unjoin the domain but with the local admin account i am unable to unjoin the domain.
Access denied????
We are using win xp machines and 2003 servers
can anyone advise on how to use the machine again in the domain?
At this point we are close to reinstall the machine harddrive again and try again. But it must be more simpler way to solve this problem?
Regards Ger

Answer 1

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