Hey, what were you playing? SP/MP,using any mods etc.

We need crash dump files from this folder to analyze your problem.
C:\Users\<Name>\AppData\Local\Arma 3\
Can you upload somewhere in winrar package, please?
Archive smaller than 5000 KB can be attached directly to the ticket. For bigger archives, please use some free sharing service and post link here.

How to find correct crashdump file:
Try to make the crash happen
Look into crashdump folder
Upload crashdump with latest date in name (crashdump is rpt + bidmp + mdmp file with same name). Please try to provide as many crashdumps as possible, it helps us investigating the problem in a big way.

Thank you.

http://feedback.arma3.com/how-to-user.html

mp - king of the hill
no mods
i do have dlc, karts heli sniper etc

I followed instructions but have no app data file in <name>, i have one in default.migrated but no sign of Arma3

when launching Arma i also get a message at the bottom saying not updated, steam not running

I've uploaded my crash dump files to the file upload section, sorry for the double post but i had problems trying to edit my previous post.

Thanks in advance.

Appdata is hidden by default if I'm not mistaking. I believe you can access it by typing %APPDATA% in the program called Run, if you are using Windows.

thanks for your help but if you notice the note above yours it clearly states that i found and uploaded the dump files