Problems connecting to servers



I am using a PowerBook G4 running Mac OS X 10.3.2.
When i try and use the connect to server program, i type in the ip address but an error comes up saying: Could not connect to the server because the name and password is not correct'.

I have tried creating user names on the other computer (which is running Windows 2003). I have also tried connecting to A WinXP.

My friend has the same laptop but has had no problems with this function...

Any idea's???

It's important..
(e-mail is [email protected]) pls email me the answers if possible


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