Hi all, please don't berate me when I tell you what i discovered the reason was as to why I wasn't able to create the stamp layer. 
Now after reseting photoshop prior to this problem, in the keyboard shortcut menu panel I had uploaded saved keyboard shortcut preset I had created in times past, and I have discovered when switching between that one and the photoshop default keyboard shortcuts, that stamp layer shortcut was not working in the one I have created. I think I had assigned default photoshop stamp layer shortcut for another function, and forgot about it.
So now I'm back at the default photoshop keyboard functionality and the stamp layer shortcut works fine of course.
So the problem is solved. Still thanks for all of your prompt reply to my post. Its real community here. Very much appreciated.