OK, for those who had tried to install this on the corporate laptop / desktop, you will usually see a prompt for password. I had presumed you have a good reason to uninstall it and since you are uninstalling it, you should have the rights to do so.
Ok, supposely you really forgot the password. First, lets hack away the password. All you need to do is to change 2 flags in the registry:
LockUnloadServices set to 0
UseVPUninstallPassword set to 0
Or simply download my registry patch here to apply the above:http://www.mediafire.com/?sharekey=a6389285a6bbf414b64026cfc0611236456b9507239db4aace018c8114394287
After which, the rest is standard. Just uninstall NAV via Add/Remove or via MSIEXEC if you know how to go about doing it.