Hello and thank you for your rapid response. I was just leaving home for the day when it arrived so didn't have opportunity to respond. To answer your questions, the videos I refer to are all commercially purchased DVD's - primarily education, science, etc. I never noticed what the program was that played them, I simply inserted the DVD and it played. I haven't purchased any such player software, but it looks like something called Windows DVD Player is the program - it is what plays the DVD's on the laptop. When I use the "ask me" box, and enter Windows DVD Player on the desktop PC it ultimately directs me to a Microsoft store that I can buy it for $14.99. What is seems like is that it was originally installed with Windows 10 but this latest "update" may have updated it off my computer to force me to buy it. I suppose when my laptop is "updated", it too will be updated out of existence. Am I correct in this? Thanks.