Place this file in c:\windows\system32\drivers\etc

Use this file to prevent your computer from connecting to selected
internet hosts. This is an easy and effective way to protect you from
many types of spyware, reduces bandwidth use, blocks certain pop-up
traps, prevents user tracking by way of “web bugs” embedded in spam,
provides partial protection to IE from certain web-based exploits and
blocks most advertising you would otherwise be subjected to on the
internet.