I've been using AVG Anti-Rootkit Free but see that AVG aren't updating the free version anymore. Can anyone tell me if the Zone Alarm Security Suite can handle rootkits or do I need something else (sorry, but free if possible).

I'm using Ad-Aware 2007, SpywareBlaster, and Windows Defender in addition to ZASS, but have my doubts whether they can protect me against rootkits.