To Change your DNS :
Open
Network Connections by clicking the
Start button Picture of the Start button, clicking
Control Panel, clicking
Network and Internet, clicking
Network and Sharing Center, and then clicking
Manage network connections.
2.
Right-click the connection that you want to change, and then click
Properties. Administrator permission required If you are 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
Internet Protocol Version 4 (TCP/IPv4)
4.Now,To specify DNS server address settings, do one of the following:
•To specify a DNS server address, 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.

Click OK then Click Close