Use o OpenDNS.
De aqui ,
Windows 7
1. Open Network Connections by clicking the Start button Picture of the
Start button, and then clicking Control Panel. In the search box,
type adapter, and then, under Network and Sharing Center, click View
network connections.
2. Right-click the connection that you want to change, and then click
Properties. Administrator permission required If you're prompted for
an administrator password or confirmation, type the password or
provide confirmation.
3. Click the Networking tab. Under This connection uses the following
items, click either Internet Protocol Version 4 (TCP/IPv4) or
Internet Protocol Version 6 (TCP/IPv6), and then click Properties.
4. click Use the following DNS server addresses, and then, in the
Preferred DNS server and Alternate DNS server boxes, type the
addresses of the primary and secondary DNS servers.
Primary: 208.67.222.222
Alternative: 208.67.220.220
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