How is anyone supposed to play this?

There was a post here asking about the demo in regards to it not working. The demo works now, but I have encountered a problem. I accidentally hit 'F' which seems like the button for fullscreen/minimize. The windowed mode it was supposed to go into was a minimized version just showing the minimize/fullscreen/close buttons on the top right of every window. Now, when I start the demo, the splash screen looks like random dumped assets, then goes to black. I can not progress past that and I have tried reins...

Vorrei tanto prvoare questo gioco ma il fatto è che io scelgo il personaggio clicco su ready e non succede nulla,io l'ho provato sulla demo,non è che per caso sia solo multigiocatore?PERFAVORE RISPONDETE!!

So I was able to play this game when i first bought it. Now the game won't even start up properly. It starts up and the images are all out of whack and I can hear the main menu music but the screen is black.. anyone else came to this problem? I even verified the cache, uninstall and reinstalled the game....

The game looks cool and all but it seems very multi-player based. Some sort of upgrade system could offset that.