With Win 98 this process worked as it should.Now that I have Win XP the procedure no long works.
An initial scanning screen come up for a second and the disappears.
Is this a problem with users of Win XP
Right click Avast Taskbar Icon/and check Program Settings
Sorry Paultros
Bloody rude of me 
Yes welcome to the Avast forum you will find some very useful info on this forum
Welcome to the forums, Paultros ! 
Be sure to come back often … learn more … and maybe help someone.