Depends what one means by "win".
If one means one big world map with a swastika flag over the non Japanese and non Italian parts, you'd probably need a PoD so far in the past that the rise of the Nazi party itself becomes uncertain.
If one means a world in which Nazi Germany succeeds in holding onto most of its west European conquests, and this outcome is eventually ratified by a treaty of some sort, I believe there are two times when this conceivably could have happened: (1) British acceptance of armistice terms after the fall of France or (less likely but not completely impossible) after (2) A complete German victory in the D-Day invasion. Also, these leave out the German/USSR conflict, which really makes any sort of peaceful end to WW2 short of complete German defeat improbable. Would, could the Nazis have ever accepted a powerful USSR over the long haul?