“The network folder specified is currently mapped using a different user name and password”, when trying to connect to a drive remotely.

What a pain!
I know I’m not connected, but it won’t let me connect.
The problem here is with the error message.
Really what they meant to say was ‘there is a share in use that is blocking you. Go to command prompt and type
net use

Anything there?
So delete it
net use /delete /(share name)

Now you’re good to go!

More details here:

http://answers.microsoft.com/en-us/windows/forum/windows_vista-networking/the-network-folder-specified-is-currently-mapped/928f6313-fe2c-4d2d-a247-152ec022e062