This is the old (working) PC: And this is the new (non-working) PC: As you can see , they are identical. I have also unplugged the network, disabled the Wifi, disabled the BitDefender Anti-Virus and all Windows security measures. I suppose the only thing I can now realistically do is to trash my hard drive and re-install all my applications etc. from scratch starting with Minitioune ... or give up, sell my Minitiouner and other DATV kit and forget the whole thing ....
I’ve uninstalled and re-installed all the MiniTioune software multiple times.
Oh well. Looks like it’s going to be a long haul!!
Microsoft removes HEVC codec in Windows 10 Fall Creators Update, adds it to Store
New installations of Microsoft's most recent version of Windows 10, the Fall Creators Update version or version 1709, come without support for the HEVC codec.
Users who install the system anew or for the first time may notice that the codec is missing, and may install the HEVC Video Extension from the Microsoft Store to restore the functionality.
Microsoft removed support for the HEVC codec from Windows 10 Fall Creators Update for new installations. Systems that are upgraded to the Fall Creators Update version are not affected, as the codec is carried over in that scenario.
Users who try to play videos that require the codec will get a black screen or an error message instead depending on the app or program they use to access the content. This is true even for Microsoft's own programs such as official Movies & TV application.
I have dowloaded and installed the HEVC extension from the Windows store (it was 79p!) and re-installed the "Film and TV" app but of course, it makes no difference.
I think this is a salutary warning not to try to use this DATV software on any new computers. At least I know I can throw the DATV kit into a drawer and forget all about it for the time being ...
Thank you so much for your help advice and especially patience!