Block incoming traffic from specific ip address

Question

How do I block incoming connections from a specific IP address in Windows XP without installing a firewall?

I've found this: http://www.ehow.com/how_5038640_block-ip-address-windows-xp.html But I can't figure out how to do it? Step 3 seems to block all traffic on a specific port/protocol? What GUI is he talking about in step 4?

Answer 1

Found the following guide: http://www.petri.co.il/block_web_browsing_with_ipsec.htm