My Alt+PrintScreen has stopped working

[Microsoft Windows]

The PrintScreen button on my keyboard gives me a copy of the whole screen, which is what it is supposed to do. For many years I have used the Alt+PrintScreen command to get a print of the active window instead of the whole screen.Recently this has changed, so that the Alt+PrintScreen command now gives a print of the whole window.I haven't changed my keyboard, so I presume the fault is elsewhere, because the Alt key works OK with other functions, such as Alt+F4 to select the Shutdown menu.Please can you help me return the Alt+PrintScreen command to giving me just a print of the active window?Wi

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