Hey guys - really appreciate you offering your advice and I'm kind've relieved that you're all saying what I've been thinking myself, especially regarding the driver issues.
I mean, we all use these DAWs for one reason - to write and record our music and personally speaking, as I'm at an age where playing out live is no longer an option, being able to write and record my own stuff has been a real boon. Fiddling about with computers is probably on my list of top 10 most frustrating things to do

and the prospect of having to re-configure Sonar in Windows 10 is not one I relish.
So I'm sticking with good old reliable Win7 - thanks for you input, Dan, John and mettelus - gratefully received!

ji