Now I am having the same problem. And I tried EVERY solution you listed in this forum. Also, my username only has letters and numbers, nothing else.
As soon as I open the game, it comes up but its just a black screen, won't go to the main menu and is freezes my computer SO bad that the mouse vanishes and I can't even access my task manager to end the program, I end up having to do an emergency shut down by holding my processor button in.
I'm having the SAME issue as this user and nothing I do will work. And also, I had this game installed in this same computer only a little over a week ago and it worked fine.
I uninstalled because I was annoyed about being banned and figured I'd reinstall it later. If I had ever known it would have been this much of a headache...someone has to figure out what's wrong. PLEASE help!