If you are wanting to do an “audit” of your computer security, you probably do the obvious which includes scan for mal-ware, Windows update, check your firewall, etc., but if you really want to get down and dirty, there is a lot more you can do.

This security checklist article gives a very good starting point. It is comprehensive and covers all aspects of home security.

This article is 3 years old, so some of the information may be outdated, however the checklist items remain good.