Having posted this question only a few minutes ago, I have found the answer…………The Uninstallers only work if NO OTHER flash dives are plugged in!!!
So if our excellent editors are reading this, perhaps a tip on one of your pages would help other “Dimwits” like me, and avoid an afternoon of sheer frustration!!!
Sandisk please note, a little hint like this on you help pages would have resulted in my having more hair now than I did earlier today!!!!!!!