An upgrade from Windows 7 to 10 could well have retained some files/components that the AverMedia card required. Whereas a clean install of Windows 10 wouldn't have those components.
Microsoft built some pretty neat stuff in developing WMC, and by default a lot of it became the standard and enabled other TV applications. Many TV related software and hardware relied on WMC components, and they aren't as easy to replace as one would think. Just think about the Copy Once capability of WMC for an obvious example.
I believe that the OTA functions of the AverMedia card will be using a standard
BDA driver, as that is what MC uses for ATSC and DVB broadcast signals. The QAM signals, on the other hand, would rely on an AverMedia driver. Obviously their Aver MediaCenter software is capable of receiving QAM signals, but creating a Windows 10 driver that other software can use is a little harder, given the conditions Microsoft puts on the use of drivers.
I think either AverMedia need to provide a Windows 10 driver, or you need to replace the card with something that works.