I've terminated all unncessary programs.

Finaly, I observe that arma don't crash but is very long to charge the multiplayer mode. During many minutes i have no response of Arma.

I don't nnow if it help you, but I noticed that I have the same problem with teampspeak. Very long to charge.

I've reinstalled windows. Now it works perfectly.

Thank you for your help.

i've add a screen capture of crash.

For the first time, multiplayer works. But after five minutes with the screen capture i've add.

dxdiag upload.
Game cache verified.
Always crash.

How can i run arma as an admin via steam ?

Sorry, I dont have bidmp and mdmp files. Only rpt