Secure your Desktop Icons and Settings :

You can save your desktop settings and secure it from your nerdy friend by playing with the
registry. 
Simply launch the Registry Editor go to:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer


In the right pane create a new DWORD Value named NoSaveSettings and modify it's value to


1. Refresh and restart for the settings to get saved.