|Blocking Unwanted Parasites with a Hosts File|
Also down that page is another method, rather than doing the HOSTS file, of placing the
"DNS Client" Service in Manual (if you are the only user, and not part of a domain).
Services restart with every boot, so uncheck the service on the Services tab in msconfig.
Then again, you cannot restart the service via services.mmc, but go back into msconfig.