Try this 1.
1)Click on Start --> Run --> type cmd and click on OK.
Command Prompt will be opened. Then enter this command.
ipconfig /flushdns and press "Enter".
Now try to open Microsoft website.
2)If the problem still exits, then click on Start --> Run --> type services.msc and
click on OK --> Right-click on "DNS Client" and select "Stop".
3)Click on the below link and download the file.
Double-click on that file and follow the instructions.