Domain not available?

[Alex]

I'm running a wireless/wired network in my house using a
D-Link router, a wired computer running XP Pro, a
wireless laptop running XP Pro, and a wireless computer
running XP Pro. I run these all in a workgroup called
WORKGROUP. My computer upstairs is called "upstairs", the
laptop is "laptop" and the computer downstairs
is "downstairs."
My mother is having trouble with her "downstairs"
computer. When she tries to log in, she gets the
message "the system cannot log you on now because the
domain DOWNSTAIRS is not available."
I've tried rebooting my router, and using an ethernet
cable to connect her downstairs computer. She still gets
the message and cannot log on. What can we do?

 

[Rob Elder, MVP-Networking]

Was this PC joined to a domain at one point? It thinks it is now. Use
System properties to unjoin the domain and rejoin the workgroup.

 

[Guest]

Thanks for the response. I understand how to join the
workgroup, but the problem is that I cannot log in to the
computer even as administrator, or even in safe mode. If
I could get in to the computer, I could easily change it
back to workgroup.
-Alex Dominey