How to solve “server DNS address could not be found” error in windows

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Goto 
Control Panel
\Network and Internet\
Network and Sharing Center > Click 
Change Adapter setting> 
Right click select properties of wifi> 
select internet protocol version 4 > 
click on use the following DNS server address and type either of the 2 DNS given below.

 Preferred DNS server as: 8.8.8.8 
Alternate DNS server as: 8.8.4.4
Preferred DNS server as: 208.67.222.222 
Alternate DNS server as: 208.67.220.220

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