There are many general restrictions you can make to start Menu, the Explorer and to the Desktop itself.
1. Star Regedit
2. Go to HKEY_Current_User/Software/Microsoft/Windows/CurrentVersion/Policies.
3. There should already be at least a Explorer section there already.
4. Additional keys that can be created under Policies are WinOldApp.
5. You can then add DWORD values set to 1 in the appropriate keys.
6. To re-enable them, either delete the key or set the value to 0.
# ClearRecentDocsOnExit = Clear of Recent Documents on Exit.
# NoAdPrinter = Adding new printers
# NoClose = Computer Shutdown
# NoDeletePrinter = Delete Installed Printers.
# NoDesktop = Does't show Desktop items as well and Desktop right-click menu.
# NoDevMgrUpdate = Windows 98/ME web Update Manager
# NoDrivers[hex] = Hides Drives in my computer
# NoFind = Find command
# NoInternetIcon = Internet Icon on Desktop
# NoNetHood = Network Neighborhood
# NoRecentDocsHistory = Recent Documents in Start Menu
# NoRun = Run command
# NoSaveSettings = Save Settings on exit
# NoSetFolders = Folders in Start Menu->Settings
# NoSetTaskbar = Taskbar in Start Menu-> Settings
# NoSMMyDocs = My Documents folder in Start Menu
# NoSMMyPictures = My pictures folder in Start Menu
# NoWindowsUpdate = Windows web Update
