I would assume you are using Windows XP..
Check these articles:
How to Set IP Address, DNS and Other Network Information in Windows XP
http://www.home-network-help.com/set-ip.html
Opendns: Safer, Faster and Smarter Free DNS Service
http://www.home-network-help.com/opendns.html
Hope helps...
picoHat
March 2007