assign yourself another DNS server.
Asssign yourself google's dns server (8.8.8.8)
If you don't know how to do this. I can show you.
-Right Click on your internet icon in the bottom right of your taskbar
-Go to Network Sharing Center
-Click on "Change Adapter Settings"
-Go to the adapter you are using (local area if wired, wireless if not)
-Right click on it and hit "Properties"
-Under networking tab, look for "Internet Protocal Version 4 (TCP/IPv4)
-Select it
-Hit Properties
-Under General tab at the bottom you will have "Obtain DNS server automatically" selected
-Switch this to "use the following DNS server addresses"
-Enter this for preferred 8.8.8.8
-Enter this for alternate 8.8.4.4
after this flush your own dns cache.
Open up command prompt
Run this command: ipconfig /flushdns
Now try again
EDIT: Added a pic to help