Thanks for your patience.
I have retroarch as the one NES should use. In the retorarch emulator settings NES is listed with mesen as the core.
The core is installed in retroarch,
The system name is nintendo entertainment system, the name in the emulator settings is nintendo entertainment system.
Plaing an NES game does nothing, playing a SNES game works fine. I'll apply the key I have purchased see if that does anything,