one simple solution would be to get yourself a firewall, and block the ports with that... here are a few free ones:

ZoneAlarm (www.zonealarm.com/products/za/pestpatrol.html)
Kerio Personal Firewall (www.kerio.com/us/kpf_home.html)
Outpost Firewall (www.agnitum.com/products/outpost/)

Hope that helps!