i found a nice FREE firewall and its not a trial either so its totally free
i been using it for a few days now and it works very good like norton firewall it tells you when anything happens on your computer and its easy to use
http://www.jetico.com/jpfwall.exe thats the link another good site to use with it is http://virusscan.jotti.org/ uses like 11 virus scanners jus incase something is running and the firewall ask you to block it or unblock it and your not sure if its a virus