Avast 4.8 wont start scanning automatically

I have set my Avast 4.8 to scan every Friday night at 7.30PM. It goes through the memory test and then brings up the Avast screen. Nothing happens unless I start it myself . I would like it to scan automatically at 7.30 PM every Friday without me having to be there.
Any suggestions or solutions to my problem?

Maybe this will help you:
http://forum.avast.com/index.php?board=2;action=display;threadid=3796.0

You can’t schedule in Home version. Only in Professional.

Howto do with Home version: http://forum.avast.com/index.php?topic=3796.msg27225#msg27225
Drawbacks on Home version: http://forum.avast.com/index.php?topic=29962.msg246925#msg246925

Its the same thing. :o

Yeah, sorry. I’ve realized after clicking the ‘post’ button ;D