admin PW

This sounds simplistic but you would be amazed how often this happens: don't forget what you changed the password to!
Also, make sure the Administrator account is not being used in any batch files or for any Services on any machines to run under.If someone set the Alerter service to run under the Administrator account, then when you change the password, the service will fail and not start.
I have experienced that this is the main problem. It is easy to set the Administrator account to be used by services. So, check this out.
Other than that, it should be ok.

I've got a batch file somewhere (relies on some resource kit utilities) that runs through all machines in a domain and lists services that aren't running as system. If you want me to dig it out, send me an email through the Peer system.

Regards
Richard