Sleeping mode cannot be activated in PC Tune-up

In order to improve computer performance I want to activate the sleeping mode for background programs. But it is not possible to activate. Any hints?

Hello, Hans.

Do you mean you are trying to put programs running in the background to sleep using AVG PC TuneUp? Please provide us with a screenshot ( http://avgclick.me/getscreenshot ) of the error message if it generates any when you try this. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions.