How to Fix a DNS Error if You Cannot Find the Server When Trying to Connect to the Internet
Sometimes a Domain Name Service (DNS) server can become unresponsive. This happens as ISPs lose connectivity, servers crash or networks suffer an outage. When the DNS server you are using is down, it cannot be located. This impacts your computer because a DNS server provides the IP address of a domain name. For example, when you request "yahoo.com" you are given the IP address of the yahoo.com server, which is required to establish a connection. When your DNS server is unresponsive, you can often rectify the problem by temporarily using a free, public DNS server.
Open the "Start" menu, and click "Control Panel."menu
Type "adapter" in the search box on the upper-right corner of the page.
Click "View Network Connections" in the list of results.
Right-click your current connection, such as "Wireless Network Connection" for wireless or "Local Area Connection" for LAN connections.
Click "Properties" on the drop-down menu.
Click the "Networking" tab.
Select "Internet Protocol Version 4 (TCP/IPv4)," and then click "Properties."
Select "Use the following DNS server addresses" to open the DNS specification fields.
Type a primary and secondary DNS server into the respective fields. For example, Google offers free DNS servers at the IP addresses: 18.104.22.168 and 22.214.171.124. A list of public DNS servers is available at techpp.com.
Click "OK" to save your settings. Your connection will now route to the newly specified nameserver.