Hello,
Thank you for reporting the issue.
We need crash dump files from this folder for solve your problem.
C:\Users\<Name>\AppData\Local\Arma 3\
Can you upload somewhere in winrar package please?
When package will be smaller than 5000k, you can attach it here. When package is bigger, 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

https://www.mediafire.com/?e6rj94wh9nlhbvq

Thank you for the crashdumps, we will analyse them and let you know.

3 days later. I still have the same crashes. I'm waiting for a solution. I uploaded files of an other crash.

Hello,
we are still analysing your crashdumps, thank you for adding another. Sorry for inconveniences, such analysis may take a while.

I bought Arma 3 and I can't have fun with it because I crash. It's
inadmissible and really annoying.