Hi,
First, I would like to share the following with you.
In the Show Contents dialog box, click Add, type the name of the remote computer (server) in this format: TERMSRV\<computername>, and then click OK.
So I need to advise that the format is TERMSRV\ rather than TERMSRV/.
For detailed information, Please refer to the following link,
http://windows.microsoft.com/en-US/windows-vista/Troubleshoot-Remote-Desktop-problems
Otherwise, you may delete the already saved credential in the Credential Manager when you finish implementing the action above.
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