Step 1 - Open your Control Panel > Network and Internet > Network and Sharing Center

Step 2 - Click on Change adapter settings ( as the pic above ) located on the left side corner
Step 3 - For Desktop PCs , you would want to right click on Local Area Network , as for Laptops which is on Wi-Fi, right click on the Wireless Network Connection , Right click on it and press properties

Step 5 - A menu will come out as the picture above. Select Internet Protocol Version 4 and click on properties

Last step - Under the lower part of the box, change the settings to Use the following DNS server addresses. Type in 8 8 8 8 for first box , 8 8 4 4 for the second box.
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UPDATED : It seems few people still can't access to the sites, try using other DNS
A- 156.154.70.1 & 156.154.71.1
B - 208.67.222.222 & 208.67.220.220
C - 198.153.192.1 & 198.153.194.1