I downloaded the Windows 7 upgrade advisor from Microsoft, that is currently in beta on both my work and my home pc to see what the differences were. The work laptop had some warnings but the software fails on the home pc. I get a very unhelpful message of “Windows 7 Upgrade advisor ran into a problem scanning your devices. Upgrade advisor needs to be able to scan your devices to determine if your computer is capable of running Windows 7. Please let us know about this problem.”
Unfortunately there is no UI to send the feedback to Microsoft and there is nothing on the download page either.