"unable to find filter to import" Preview web page or site Web Designer 10 premium

Preview page or site doesn't work on Web Designer 10 premium.
I get error message "unable to find filter to import that file with".

Windows 7
use Chrome and IE 9.

Does anyone know of an easy fix?

thanks,
-Steve

right click the web designer icon and select 'run as administrator' that should fix it.

yes, thanks that works.
-SJ