I have working on my server --- doing some backup work. I noticed that server was reacting slowly for some unknown reason. Working on a company network with 20 or so server and they use A/D and GPO's.
Once I restarted my server --- and logged in ( I had NO icons and NO task bar) :: in the very bottom left corner of the screen -- I see the message that my version of 2008 Enterprise IS NOT Valid. I know for a fact that I used the authorized version and activate the license some 18 months ago. I have never saw this message before. The server was very slow to restart -- indicating that "group policy client services" were updating.
When I attempted to perform "gpresult" to a file to look at the group policies that my server is receiving "I received an error -- stating ACCESS Denied". I can no longer access anything and before rebooting the server, I was having problems changing passwords for a backup service account --- the services would not restart.