How do I reconnect to a UNC share using different credentials

Solution 1:

You may be able to clear the cached credentials by using the Credential Manager in the Control Panel.

Try browse into the Control Panel, enter "Credential Manager" into the search bar on the top right, then click on the "Credential Manager" result. You may find your cached credentials under the "Windows Credentials" section, if so you can click "Remove from vault" to clear them.

Solution 2:

Just to add to the confusion, in Windows 7 (Vista and later actually), a regular command prompt maintains a separate set of mapped drives and credentials when compared to an elevated (run as administrator) command prompt. So if you map a drive with an elevated command prompt, it won't be visible in a regular (non-elevated) command prompt.

More info here: http://technet.microsoft.com/en-us/library/ee844140(v=ws.10).aspx