Mafia II(2) problem! PLEASE HELP!

[Andy543]

So as the title says I have a problem with Mafia II, the game launches, the picture intro with PhysX by Nvidia shows but the video intro doesn't and my game doesn't go to the main menu it just stays black, I can Alt-Tab, I can start Task Manager, it doesn't show "Not responding" in task manager either, I can close it from task manager and try to open it again and it's the same. 

I've tried reinstalling the game, deleting videoconfig file, reinstalling PhysX, runnning in compatibility mode for Windows 7, running the game as administrator, running Steam as an administrator.

This is the video showing the problem, don't know if I can post youtube links here so I am sorry if it's not ok but it's just showing my problem.

The problem started like this:

Yesterday I wanted to install a trainer to have some fun in Mafia 2 because I've finished the story like 5-6 times by now and it's still amazing but as I said I wanted to have some fun and I've seen this https://www. nexusmods .com/mafia2/mods/114(just get the link together, sorry for posting other site link but again just so the people can see what it is, not recommending to download at all as my game began to have problems). I downloaded the trainer, installed as it said in the readme file and the game launched, it worked and I could play the game, the only problem was that I didn't have my save game anymore, I had a backup save game of course and I put that in, it didn't work, the game started with no problems, got to the main menu but again no save game so I reinstalled the game and then this problem appeared and now I can't even play the game anymore after reinstalling it 5 times(2 times in drive C, 3 times in drive D where it originally was). And I did everything I said in the first place so if anybody can help me I would really really really appreciate it.