Mapped drives are not available from an elevated prompt when UAC is configured to Prompt for credentials
Detail to configure the EnableLinkedConnections registry entry In Registry Editor, locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System Right-click Configuration, select New, and then select DWORD (32-bit) Value. Name the new registry entry as EnableLinkedConnections. Double-click the EnableLinkedConnections registry entry. In the Edit DWORD Value dialog box, type 1 in the Value data field, […]