The fault here is almost certainly in the application - not the OS.

There are a lot of lazy programmers writing trashy PC code who had just been "getting away with it" when Windoze had no security and/or users, by default, did everything as Administrator.

I have a disappointingly large number of programs that just won't work on XP except with Administrator priviledge - so it's hardly surprising that things get worse with Vista and later!

:-(

And, when this trash doesn't work, any messages usually are obscure - very rarely do they explicitly say, "you need to be an Administrator to run this"

Worse, the packaging never mentions this, so you can't find out until you've installed it - and you usually can't get a refund after you've installed it!

:-(