Upon reflection, I've realised that the guy who wrote the error message to which I previously referred was being rather astute. Although it is a Windows error message, it is not necessarily Windows that gets the blame. At least, not in some people's minds. The 'Not Responding' message comes up most often in the title bar next to the programme name. The message, in effect, implies that 'this programme is not responding' - which, I suppose, technically it is. The implication is that it is the programme that is at fault. Perhaps that programme is not quite good enough to be running perfectly under Windows. However, with so many different programmes from so many different software companies giving much the same message, it is unlikely that that is really the case. Rather, it is Windows that is causing these programmes not to respond; it is Windows' fault more than the programme itself.
The message should perhaps read: 'Windows is not allowing this programme to respond because it is doing something else and so preventing you from getting on with what you want to be doing'.