Block ports on Workstations

Yes, you can install a port monitor. However, nothing screams "Hack Me!" like a port monitor to a port scanner, so I would instead recommend a personal firewall, which is a little different than just blocking stuff incoming. I am really fond ZoneAlarm myself.
There are several free versions of both prt scanners and firewalls. See http://grc.com for an overview.

HTH
Nikki

How to block ports and protocols through Windows 2000. (Note: This technique is no substitute for a true firewall. It's only a method of making your network a little more secure.)

http://www.earthweb.com/article/0,,10456_625111,00.html

Windows 2000 Port Invites Intruders:

http://www.newsbytes.com/news/01/169408.html

This article describes how administrators can use the RestrictAnonymous registry value on a Windows 2000-based computer to restrict access over anonymous connections.
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q246261

How To Eliminate The Ten Most Critical
Internet Security Threats

http://www.sans.org/topten.htm

(REMOVE ALL SPACES from the pasted URLs.)

Maxwell

open the Local Area network Connection. View the Properties of TCP/IP and click on the advanced button. On the 4th tab, Options, you have TCP/iP filtering. turn it on and modify for what you need to do.
David R