Hi and sorry about your trouble.
Please try the following:

• verifying the data (Steam Library - Rightclick on DayZ - Properties - Local files - Verify integrity of game cache)
• reinstalling the game
• launching Steam and the game as Administrator
• launching the game with different parameters as described here (http://forums.dayzgame.com/index.php?/topic/203970-resolution-problems-read-here-before-posting/ [^]) - you can also try changing the windowed parameter in the .cfg file to 1 and launching the game
• ensure that your drivers, especially for graphics card are up to date.

If neither helps, please attach the contents of your AppData folder (C:\Users\<Name>\AppData\Local\DayZ\) to the ticket
Thanks,
Andy

i did all that before and still but i uploaded what you said

Hi seanjn57,
I am afraid you misunderstood me, what I need you to attach is the contents of the folder (.rpt, .mdmp and .bidmp files wil suffice) to this ticket in a .rar.
Thanks,
Andy