BluntForce (DayZ)

I recently did the 0.61 update but now when I launch the game it goes to the screen that says DayZ but before it loads to the main menu the screen goes black, adventually says DayZ is not responding and it freezes my computer and I have to restart it to get it to work again. It does this everytime I try to start DayZ and it used to work perfectly fine until I did the 0.61 update,..... Can someone help me figure out the fix for this please?? Thanx in advance