Windows Vista / Windows 7
-->Go to Control Panel
-->Then Network and Sharing Center
-->Go to your current network settings
-->Find in the list the Internet Protocol Version 4 (TCP/IPv4)
-->Go to Properties
-->Change Obtain DNS server address automatically to Use the following DNS server addresses:
---->Preferrered DNS server: 8.8.8.8
---->Alternate DNS server: 8.8.4.4
-->press OK


Windows 8 Thanks Banthalos for confirmation
1. Go to Control panel
2. Select Network and Internet
3.-> Network and Sharing center
4. -> Change adapter settings (its on the left)
5. [Select ur network adapter] + right click -> properties
6.Find in the list the Internet Protocol Version 4 (TCP/IPv4) and click on properties
-->Change Obtain DNS server address automatically to Use the following DNS server addresses:
---->Preferrered DNS server: 8.8.8.8
---->Alternate DNS server: 8.8.4.4
-->press OK