How to Block the specific IP to reach my computer

[HEATH]

How to Block the specific IP to reach my computer? I have installed the Zone Alarm and it alert me someone trying to make a inbound communication on NetBIOS port 137 on my computer for several times!!!!!! Lucky Zone Alarm has helped me to block this f**king action. The hacker IP is 61.155.107.247 and I checked that it is from Beijing.

Anyone can tell me what can I do? Moreover I have a Win2K Adv server too, but it has many service need to run so I can't and don't how to make a firewall for it. Now I turn It off temporary. Anyone know what firewall for Adv server is good and flexible? Really Really need flexible, coz many services are running, such as POP, SMTP, Web, FTP, MySQL, etc.... and Is there any way to block the access from some specific IP???