Problems mapping a drive as a different user

I got the following error while trying to map to an administrative share from a users computers. "Network folder specified is currently mapped using a different user name and password"

No such mapping was showing under "My Computer"

A fellow blogger had a post that helped.
http://travisepperson.blogspot.com/2007/01/windows-network-folder-specified-is.html

In a nut shell, at a command prompt (start menu, run, cmd ). Ran command "net use" and saw that there was a connection that was not showing up in "My Computer" window.
Command "net use file://servername/ShareName /delete" fixed the problem and now I can map the drive.