"Namebench hunts down the fastest DNS servers available for your computer to use. namebench runs a fair and thorough benchmark using your web browser history, tcpdump output, or standardized datasets in order to provide an individualized recommendation. namebench is completely free and does not modify your system in any way."
Optional: Test speed at
http://www.speedtest.net before and after
1. Download Namebench -
http://code.google.com/p/namebench/
2. Run Namebench
3. Open Control Panel > Network and Internet > Network and Sharing Center
3a. Click on your local network
3b. Click the properties button then highlight Internet Protocol Version 4(TCP/IPv4)
3c. Press the properties button and select "Use the following DNS server addresses"
4. Check Namebench. Once it is finished, look at the part that says "recommended configuration"
5. Click on the window that you opened in step 3c. Type the top two DNS servers into "Preferred DNS server" and "Alternate DNS server"
