Can't launch the game

[Vylsain]

Hello.

It has been a few days since I can't launch the game anymore.

On STEAM, the "preparing to launch IL2..." windows appears baraely 1 second and disappears.

Using directly the launch.exe is not better. As soon as I execute it : "Launcher has stopped working".

I did the following things :
-reinstall the game
-reinstall STEAM
-clean the register
-change graphic driver
-install the russian version

None of it worked... And the game was working well a few days ago...

My specs :
P8P67 Pro
i5 2500K
GTX 570
4Gb ram
Win 7 64 bits

I hope there will be some support from 1C or I'll be forced to ask to be reimbursed...