DNS Address Could Not be Found Error

Hello,
As I read You dont configure your DNS address in your network.
Actually A system uses its default DNS address. But As we have a issue there so we can configure your DNS servers manually.
To do this
1. You have to click on taskbar wifi signal and right click there then you choose open network and security center.
2. Then choose change Adaptor settings.
3. select properties of an connection then choose ipv4.
And put one of the DNS server address which is 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