Thank you, Altrea.
For reference of other readers of this thread: the control panel v3 is found in the xampp directory, filename xampp-control-3-beta.exe.
Yes, that revealed that inetinfo.exe was using ports 80 and 443; internet search shows that it is a MS server for IIS. I stopped it, and now Apache starts. I didn't know it was there, and I have no idea what it was doing, or if I need to restart it when I am done with xampp. But anyhow, I was able to start the Apache server as desired. thanks again for your quick and helpful reply.