Something that works

It looks as if I’m going to have to completely start from scratch with my personal pc at home, and I would like to hear something good about antiviral, spyware, and maintenance programs that I should look into once reformating my computer if anyone knows of the programs that actually work well and do what they’re supose to
I wouldn’t mind hearing about them at all.

(avg 7.5.11 for example has worked just as expected with no suprises, or not yet at least)