Hi Kurayami
I excactly got the same problems like you with my Arma game. I bought the german version and patched it up to 1.08. Desktop crashes and freezes up to total freezes of the whole system.
But i have a solution for your problem with the 1st missions: when I started it first, I had the same problem with the cutscene. So i ended the game with cntrl+alt+del via the task manager. After several tries with game restarts it suddenly worked
So i played the campaign...
Hope i could help you out!
But with the other probs especialy with the freezing , which annoys me a lot i cannot help you!
Greetings Nydo