Rocco,
This is usually the result of giving users admin rights on the box. They turn around and remove Domain Admins just like in the fable of the sorcerer's apprentice.
QA,
See this thread:
Topic: local admin
Pretty much the same, only different. After you add yourself back in, you should remove the user.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.
