I think all that adds up to a very nice situation in which Europe could and might fall to the Reds. Alot depends on the attitude of the US. Without a large solid force on the ground,an alliance holding the West together, and European states already with large internal (potentially larger if the US hasn't been focused on countering) Communist parties and elements ... it's going to be hard for the US to get themselves in a position to do anything about it before it's too late. I would bet on Soviet domination of the mainland by 1965 or 70 at the latest. Italy elects themselves communist, and massive Soviet political as well as military pressure force West Germany to reunite (under the curtain) with what's left of Easter Germany while France forms some type of compromise for a few years before elections and trade/military pressure flip her as well. The UK, Norway, Finland all stick together ...
Okay
1) The very qualities which would make the Soviet actions in Eastern Europe less shocking, like permitting non-Communist parties, not stripping the industries to send them to Russia, etc...would weaken the Soviet hold on Eastern Europe. They would also cause problems with regards to invading Western Europe.
2) Western Europe holds two independent nuclear deterrents (Britain and France) as well as an industrialised population of 200 million or more. While there is some variation, with Italy one of the weakest, most of the governments are pretty stable, and not going to be toppled by Communists short of military force or ASB.
3) Just because Communism is less unpopular due to fewer atrocities in Eastern Europe and no Hungarian Uprising in '56 (presumably) it isn't going to lead to a mass flood of members to the Communist parties. The main popular left-wing parties across Europe are some form of Christian Socialists.
4) If there's a Soviet campaign to systematically undermine Western governments by ANY means, be they diplomatic pressure, insurgency, subversion, whatever - they'll lose all goodwill they retained by not trashing Eastern Europe. Cue a speedily set up common defence agreement, a rearmament of West Germany, and a distinct chilling of relations. View point two for a reminder that the combination of France, Germany and Britain are far from helpless.
Any war that did kick off would get extremely messy, with use of nuclear weapons a near-certainty unless the Russians were somehow stopped conventionally (which is near enough ASB without Yankees involved).
Europe is far more likely to end up uranium-green than Communist Red.