WinExit screen saver, which will log a user off after a specified period of inactivity.
If a non-administrative user attemps to use the WinExit screen saver, they receive:
Error encountered while creating registry key. Make sure you have set values
and create subkey permissions.
Use Security / Permissions to click on Everyone and select Special Access in the Type of Access drop-down list box. Check Set Value and Create Subkey and click OK and OK.
You can use RegDACL to set these permissions in batch.