There must be a 1-2-3 etc steps that I could follow so that I get it all correct.
Yes, that should be... but there are lots of things to do
Ok, click the button for scan hard disks on the skin, and let it go.
Default options of avast! is quite good for a normal scanning.
Best of all, come to forum, ask your questions and let us introduce you to avast! world
Welcome.