Hah

Any good Hacker will tell you firewall are useless against any skilled person,but you can use Zone Alarm or a Norton just too see if somebody attacks you!
Those attacks are not really Hackers attack but rather Lamer like Trojan, Dos, and more. Those people don’t know what they are doing,so don’t by afraid!
Firewall can by useful if a person make a scan,looking at vulnerability on the network,your PC will by invisible.
Personally I will recommend Zone Alarm because it’s FREE!!!