This was the free upgrade from Win7---and thanks, I eventually did find the correct area to right-click on and got the registration window and everything seems ok now.

So far, Win10 has been the easiest upgrade and, since it left the icons on my desktop alone, the easiest to get used to. Oddly enough, Win10 is running an old but sophisticated (and expensive) DOS medical/biological statistics program (True Epistat) that I haven't been able to start since Windows95! I hope all of the features work. Go figure!

Thanks again!

Paj
8^)