As part of securing Desktop, this tips shows how to remove the "Map Network Drive" and "Disconnect Network Drive" buttons from the toolbar in Explorer and also removes the menu items from the context menu of My Computer and the Tools menu of Explorer. This effectively restricts drive mapping. To apply, use the follow Windows NT / Windows 2000 registry hack:

Hive: HKEY_CURRENT_USER
Key: Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
Name: NoNetConnectDisconnect
Type: REG_DWORD
Value: 1 Enable
Value: 0 Disable

Desktop and Explorer Restrictions Tips:

Desktop icons hidden
File menu in Explorer is removed
Map Network Drive and Disconnect Network Drive menu from Explorer removed
Network Neighborhood icon removed and prevent network access from Explorer
Common Groups from Start Menu removed
Find command removed from Start Menu
Run command removed from Start Menu
Shut Down button removed from Start Menu
Control Panel, Printers and My Computer in Explorer hidden and on Start Menu
Taskbar on the Start Menu hidden
Most Recently Used entries removed from Run history
Menus do not display upon right click on Taskbar, Start Button, Clock, or Taskbar icons
Menus do not display upon right-click of Desktop or Explorer's Results pane.
Only programs in Restrict subkey can be run
Remove Run command from Start menu

Gives an in-depth look at the NT/Windows 95/98 system policies. Step-by-step walkthroughs.

title says it all