To start the command prompt, click on ‘Start’ button or press ‘Window’ key. Type cmd and press Enter
Now type ipconfig /all in this new window and press Enter
You will see a rather long list filled with technical things. Scroll through it and find the DNS Servers listing as shown in the screenshot in previous comment. Make sure they are same as the new DNS server IPs you just setup. If they are not this means for some reason the DNS server list was not changed…which is strange.
PS: I know its silly, but make sure you press ‘OK’ on every dialogue box you opened for changing the DNS IPs.
PPS: After changing the gateways, you can still connect to internet and access other sites? (google, yahoo?)