Yesterday, while faffing about in a program trying to decide where to save a file, I accidentally dragged one folder into another. Easily enough done - easily enough rectified. Unfortunately, the folder I dragged was the Desktop. Although the Desktop looks like a friendly enough beast, it is in fact several folders, with underlying instructions how to give priority between them. By dragging my Desktop into another folder, I disrupted the delicate balance. Result? I couldn't save anything to the Desktop, and all the icons that were on it appeared twice. ARRGGH!
I did manage to sort it out, thanks to this advice. But it involved editing the Registry, which is not something anyone should do lightly. And certainly not something a typical user should have to do. It simply shouldn't be possible to drag the Desktop into another folder - and until this sort of inconsistency is sorted (it has remained possible for at least 3 versions of Windows), Microsoft really haven't got the hang of idiot proof. We all do silly things occasionally, but we shouldn't have to blame ourselves - the software should prevent this kind of thing happening. It's what they call usability in the trade.