If you have recently added your computer to a network, or you have made changes to your DNS server configuration, these steps will show you how to configure a computer’s preferred DNS server.

Step1
Click “Start” and then click on “Control Panel.” If you are using an older version of Windows, click “Start,” point to “Settings” and then click on “Control Panel.”
Step2
Click the option in the task pane that says “Switch to Classic View” if your “Control Panel” is in “Category View.”
Step3
Double-click “Network Connections.” The “Network Connections” window will open.
Step4
Right-click “Local Area Connection” and click on “Properties.” The “Local Area Connection Properties” dialog box will appear.
Step5
Click “Internet Protocol (TCP/IP),” and then click “Properties.” The “Internet Protocol Properties” dialog box will appear.
Step6
If your computer uses DHCP to obtain a preferred DNS server, select “Obtain an IP Address Automatically” and then click “Obtain DNS Server Address Automatically.”
Step7
If your computer uses a static IP address for a preferred DNS server, select “Use the Following DNS Server Addresses” and then specify the IP address of the DNS server.