I then installed Windows 10 in Hyper-v, put in my Media Center Pro Pack SN and low and behold it installed! Encouraged by this, I stupidly whipped my system clean and did a fresh clean install of Windows 10 over my working system (backed up).
I was able to install Media Center, get it to see and play all my recorded television (wtv) as well as play them back on my Xbox via Media Center Extender -- this was not possible on the Windows 8.0 Preview a few years back.
However, I could not get WMC to complete installing my Ceton InfiniTV devices. The drivers installed properly and I could verify that they were working by using the http: page. However, Media Center could not validate my system for use with Cablecard(s). It kept erring out repeatedly -- I think the error was something about "fatal error?" This was not an error I have seen with other builds going back to Windows 7 Media Center.
After trying to get the system to pass the certification tests with the "Windows updated" video driver (AMD R700 Series) I tried installing older drivers which I knew worked on 8.1. I was still not able to get it to configure/install so I had to give up and go back to Windows 8.1. :/
However, I enjoyed the borderless window frames in 10 so much I scaled mine back as small as they would allow (1px).

I'm guessing that the new Virtual Desktop "breaks" the strict parameters set by Cablelabs and the cable industry and that the certification process will have to be reworked for 10. I was hoping to test this out by finding a "hack" to disable the Virtual Desktops, but couldn't find anything.
Has anyone else been able to get their Cablecard tuner(s) working with Windows 10? If so, how did you accomplish it?