What will be a better one firewall I can download and use for free, (http://nba.sports-sport.info/2007-nba-star.html) that will come with my windows xp and won't slow it down? :( (http://nba.sports-sport.info/index16.html)

You can use the free version of ZoneAlarm for your firewall, and the free version of AVG for your antivirus.

colin.