Thank you for your reply.
Actually it's my father-in-law's computer, he's an Il2 enthusiast

You are right, I was pretty much convinced that the game won't run smoothly with high details, but I was expecting it to start at least
However, I can reinstall the OS to W7 x64, if that's the biggest issue that prevents the game from starting. I wasn't aware of the fact that CLOD doesn't work on 32bit OS.
And we'll see what happens then