MacLover2000, thanks for your soon reply!
I understand that if System Restore is disabled, all old files, the virus files also, are removed.
But by doing so, also the opportunity of returning to an earlier system configuration is also “removed”!
Isn’t there any solution from withing avast!? I can’t believe that avast! hasn’t any feature for this itself!
I’m still waiting for an other workaround for this.