I'm a big beliver in "don't click shit you shouldn't". I run AVG to keep out stuff people using my PC might get into, and Malwarebytes to remove big problems.
For the most part, I use "format C:". Ya, it's a little overkill...but it works. Almost all my files are on another HDD, so there isn't much backing up. Every 8-12 months I just reformat and don't reinstall crap I don't use anymore.
The way I see it...if you could rebuild your engine in a few hours, wouldn't you do that instead of oil changes?