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I have an old work computer at home using Windows XP Professional. The broadband was made secure and it wouldn't connect to the network anymore.

I was fiddling around and I went into a network icon on the control panel. I ran a wizard in the hope that it would automatically produce the network key the wireless set up was asking for.

I chose "Home computer not part of a network" instead of "Business networked computer" and restarted as instructed. Now the log on does not work.

How can I switch it back in the set up so that I can log on again?

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I assume you have to join your Windows domain.

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Thank you for taking the time to reply, but the first line of your link says- "To join a domain You must be logged on as an administrator" My problem is that I can't log on. – Carrie Mar 5 '12 at 13:17
You have to use the local system administrator account that was used when the computer was initially installed. If you don't know the password for that account, we can help you with that. – Oliver Salzburg Mar 5 '12 at 13:20

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