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I'm trying to join a new computer to a domain. It asks me for the username and password, but when I enter them it says that the username and password are incorrect. But I know that they work properly on other computers.

What should I do?

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What kind of domain? Home network? Corporate network? Are you an administrator? End user? Please add more details. – H3br3wHamm3r81 Feb 18 '13 at 8:29
I you mean an AD domain, could it be that you made a typo when typing the password and the username is locked? – jaume Feb 18 '13 at 8:42
Details are important to getting a good answer. Please edit your question to include details like; what OS are you using, what type of domain, corporate or private network, how steps you are using to join the domain, etc. – CharlieRB Feb 18 '13 at 14:52

Make sure you specify the domain in the username!\administrator
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