You cannot access an administrative share on a computer that is running Windows Vista or Windows Server 2008, after you set the SrvsvcDefaultShareInfo registry entry to configure the default share permissions for a network share
Consider the following scenario. On a computer that is running Windows Vista or Windows Server 2008, you set the registry entry SrvsvcDefaultShareInfo under the following registry subkey to configure the default share permissions for a network share:
In this scenario, after you restart the computer, you cannot access an administrative share on the computer.
For example, when a user tries to access drive C by using the “\\[computer name]\C$” command, the user receives the following error message:
Windows cannot access \\[computer name]\C$
Check the spelling of the name. Otherwise, there might be a problem with your network. To try to identify and resolve network problem, click Diagnose.
Error code: 0×80070005
Access is denied
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB971277.