Cant connect to default shares within Vista
Even though by default the system drive is shared by default Vista has implemented security so that you can not connect to the administrative share ‘\\servername\c$’ If you are anything like me you live and breath using these admin shares all the time.
So it seems the only way to actually get this working is a registry entry.
***Before you perform any registry changes ensure you have a backup of it****
So here are the steps
Now you have Administrative shares again.