It is still a DNS issue.
Try what Brady suggests.
Otherwise, you'll need to set the DNS server on your local network card settings.
(I'l get screenshots up soon)
To do this, open your network connections.
rightclick the network adapter and select properties.
Select Internet Protocol Version 4 (TCP/IPv4), click properties
On the properties page, select 'Use the following DNS server addresses'
Change the preferred DNS server to the IPv4 of your ROUTER
Change the alternate DNS server to the IPv4 of your ISP (Dont use these IP addresses. I made them up as an example)
Click ok on all boxes.
Go back to command prompt, and try Brady's suggestion again