Server DNS Address Could Not Be Found

There might be problem with your DNS servers of ISP. A computer by default uses ISP DNS servers. You can manually configure your DNS servers. It is free and usually better than your ISP.

Go to Control Panel -> Network and Internet -> Network and Sharing Centre
Click on Change Adapter settings.
Right click on your connection icon (Wireless Network Connection or Local Area Connection) and select properties.
Select Internet protocol version 4.
Click on “Use the following DNS server address” and type either of the two DNS given below.

Google Public DNS

Preferred DNS server : 8.8.8.8
Alternate DNS server : 8.8.4.4

OpenDNS

Preferred DNS server : 208.67.222.222
Alternate DNS server : 208.67.220.220