Security made simple
Keep everything up to date.
I use MSE exclusively for AV. May change later but for right now it is the best bang for the buck. All my other programs are for backup and repair.
Unannounced emails. By definition, fleas follow address books. If you get an email from your church that says "Check this out!" and all there is is a link, count on it being a flea.
I never open attachments in forwarded emails. If it was forwarded unannounced, whatever you are gonna see isn't worth the risk.
Porn sites. Nuff said.
Junk, spam email. Not in a million years would I click a link.
It has been over a year since I even had a flea try to get in.