A. To stop tips for the current user you can uncheck the display checkbox on the dialog when it is displayed or edit the registry:

  1. Start the registry editor (regedit.exe)
  2. Move to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Tips
  3. Double click 'show'
  4. Change the 01 to 00
  5. Click OK
  6. Close the registry editor

To stop it being shown for new users edit the the value under HKEY_USERS\.DEFAULT and set to 0 which new users will inherit. This works under Windows 2000.