Ok, thanks for the clarification as to where to find Prefs/player/sound device. It says "primary sound driver." When I click on the down arrow to see what other choices are available, I see "Speakers (Realtek High Definition Audio)." When I clicked on that and tried to apply the change, however, I get the same error message that Music Bee won't initialize. I'm unaware of anything other than a software upgrade, probably from Windows 10, that could have caused MB to suddenly stop working. What next?