Okay, I think I've got one: a failed D-Day leads to Soviet conquest of Central Europe and the Balkans, including Greece and all of Germany. The Soviets take a much more disruptive role in Europe, encouraging the (much larger) Communist parties throughout the West to revolt. Austria's does, leading to a 20-year civil war and the collapse of much of Soviet Eastern Europe. Come 2000, Austria is ruled by the far-right Freedom Party, whose paramilitary arm constantly fights with the resurgent Communists for control. Numerous UN peacekeeping attempts have failed, resulting in a "Great Wall of Europe" stretching from Denmark to Venice. The rest of central and eastern Europe looks much the same as Austria, with rightwingers battling leftwingers in a bloody, pointless deathmatch. In the east, the now backwards and even more repressive than before USSR, forced to clamp down hard to survive, is ruled by the bloodthirsty former KGB agent Vladimir Putin. It still makes occasional, violent forays into its former sphere, though the widespread warfare soon forces them to turn back.
I should win something for that.