Welcome to Windows Seven Forums.
As far as I'm aware, you can't connect to a domain using Windows 7 Home Premium, you need to be using Windows 7 Professional upwards.
You could, if you wish, upgrade to Win 7 Pro by using the Windows Anytime Upgrade route.
All you need to do is buy the upgrade product key from Microsoft or a Microsoft retailer. The upgrade completes from around ten minutes, depending how many updates you need to install first. http://windows.microsoft.com/en-US/w...nytime-upgrade