When reporting a crash you need to upload a dxdiag report and the files from
C:/Users/<Name>/AppData/Local/DayZ/

Pack the files into a .rar file - if the RAR is smaller than 5000KB, you can attach it here. If it's larger, please upload it to a file sharing website and link it here.

For future reports please refer to the "How to guide"
http://feedback.dayzgame.com/how-to-user.html

Thanks