security software

    paid

     ZoneAlarm Extreme Security - What I use on my computers.  Not the easiest to use, but very good.

     Kaspersky Internet Security - What I have my family use.  Easy to use.

    free

     Microsoft Security Essentials - Very good, best free anti-virus and anti-malware.

     ZoneAlarm Firewall Free - Much better than the firewall Windows comes with.