Remove "Map Network Drive" and "Disconnect Network Drive"
User Configuration\Administrative Templates\Windows Components\Windows Explorer
Prevents users from using Windows Explorer or My Network Places to map or disconnect network drives.
If you enable this policy, the system removes the Map Network Drive and Disconnect Network Drive commands from the toolbar and Tools menus in Windows Explorer and My Network Places and from menus that appear when you right-click the Windows Explorer or My Network Places icons. It also removes the Add Network Place option from My Network Places.
This policy does not prevent users from using other methods to connect to network drives, such as by typing the name of a drive in the Run dialog box.
This policy was documented incorrectly on the Explain tab in Group Policy for Windows 2000. The Explain tab states incorrectly that this policy prevents users from connecting and disconnecting drives.