[size=10pt][size=10pt]I would like to know what types of scans should be scheduled and how often please?[/size][/size]
Which is your avast version? Pro or Home?
Avast Free Home Edition (sorry I forgot to mention that)
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
With Avast! Home you actually can’t schedule scans for certain times (Only in Pro). However, Avast! is constantly scanning your computer (To see scanning activity left click on the blue Avast! icon in the system tray). You can manually start a full scan using the the local disks button or just pick a file to scan using the folder selection button. I personally do a boot time scan with archive scanning enabled once a week and also do a full scan with my non-resident malware programs Malwarebytes and Superantispyware; this keeps me pretty well covered.
Thanks for posting yawetage.
I’ve forgot to say that, in fact, on-demand scanning shouldn’t be that often if you use the resident protection.
Or you can just activate the screensaver virus scan
how to activate on page 73-78 in the user guide http://www.avast.com/eng/download-user-guides-and-manual.html
A similar - but not identical thread is at: Scheduled Scans vs Shields What is Avast’s Policy?. Feel free to join that thread too.