Originally posted by jorsoft03
Windows firewall is weak, get a real one like ZoneAlarm (hey it's free!)
or Norton Internet Security if you want the whole package.
You are better off using the windows firewall instead of Norton unless you want your computer to run like crap. Also Norton's antivirus capabilities aren't what they used to be as now some viruses are able to hide from or disable Norton.
Also the windows firewall isn't that bad and is all you need if you have dialup or broadband with a router/hardware firewall.
As for blocking things, most times it will ask you if you want to allow the program to be able to access the internet. There may be a few incompatiblities with other applications but it my experience these are few in number.