I would suggest the complete security suites from either Bit Defender of Checkpoint Software. The suites contain anti-virus, anti-mailware, firewall, download protection, antispam, parental controls, anti-phishing in ne well functioninga nd unobtrusive package..... and no remembering to do manual updates like on the free alternbatives
$45 for 3 PC'shttp://www.zonealarm.com/security/en-us/zonealarm-computer-security-suite.htm
$70 for 3 PC'shttp://www.bitdefender.com/solutions/internet-security.html
If you download the free trail and don't buy at the end, you will get e-mail "reminders". Eventually the price drops about 45 days after expiration and that's the time to jump
.... I have the suites installed on about two dozen computers and they require 0 administration time.