A couple more freebies so that rates with me (:
Abtrusion Protector keeps track of software you have safely installed on your computer. No other software is allowed to run Whenever you add new software, A. P. has to be told ...Viruses will often try to use some security vulnerability in your e-mail program or in your web-browser to start themselves automatically.
Abtrusion Protector (Personal Edition Free) requires Windows NT 4.0 Windows 2000 or Windows XP.
http://www.abtrusion.com/Downloads/
a2 Free is an anti... (trojans, backdoors, hacktools, batch viruses worms, irc worms, java scripts, webserver scripts, vbs scripts, virus construction kits, denial of service tools (DoS),(DDoS), flooder, keylogger, nuker, sniffer and unix viruses).For Windows 95, 98, ME, NT4, 2000, XP and 2003 Server.
http://www.emsisoft.com/en/software/free/