I have the same problems 5 minutes ago.
I have reinstall windows 7 x64 2 hours ago.... and i stay to install all windows updates and sometime i obtained this error:
I have change the dns to 8.8.8.8 and 8.8.4.4....... after that i have opened a prompt of dos whit admin right and i executer ipconfig /flushdns and windows updates now working whitout problems...