Why does this game keep crashing?

tried playing HoI3.... played as poland... amassed a huge army 3 times bigger than what the USSR had... invaded them... and whats most likely an intentional bug in the game, even outnumbering the russians with more tanks that were a few years more devloped than theres... all my units kept shattering and being beaten dont waste your money on this,...

When I try to start hoi3 with dcl and press start, the game stops starting in steam

How do you get them? It doesn't look like I can get them on steam

So, I occupy Denmark and all of a sudden many of my divisions now have a moving speed of 1kph!?. I'm attacking Sweden (as Germany) and my troops move at a snails pace. What is going on?