I've been happy with ZoneAlarm & Trend in recent years.
I used ZoneAlarm Internet Security Suite for a while and liked it a lot. I later had to discontinue ZoneAlarm because I purchased an early 64-bit Vista laptop, and at that time, ZoneAlarm did not support 64-bit Vista. (They do now.) $39.95 to cover 3 PCs for 1 year.
I now use Trend Micro Internet Security. Also seems to work fine. I can tell, because my difficult child is always asking why certain websites are unavailable.
by the way: I'm an IT guy, and my corporation uses Trend. If it's good enough for a Silicon Valley corporation, it's good enough for home... $49.95 for a year to cover 3 PCs.
Both suites offer a lot of control over what kinds of sites you wish to allow & disallow, e.g., chat sites, alcohol, sex education, military, occult, pornography, etc., etc., to make it easy to make it age appropriate for each computer.
Both suites allow you to set time constraints on web access.
Both suites also include firewalls, full antivirus protection, & much more. Hard to beat the rates, etc. Just install the new package & deinstall your old anti-virus software.
I have stayed away from both Norton & McAfee, as I've heard of too many issues with easy child performance once they were installed. I've never had easy child performance or stability issues with Trend or ZoneLabs.
All of these packages have learning curves, it'll take a while to learn 'em.
>>> Added note: I would rate Trend a little higher in terms of ease of use. Once installed, it just seemed to work. ZoneAlarm seemed to raise alerts & ask how to proceed fairly often, even after a year of use.