Run the il2fb.exe as admin.
If that's not working...........
Better still would be to create a folder on your hard drive named IL2 1946
EG: C:\IL21946
Then copy
only the contents of the steam installation files from program files (x86)/steam/steamapps/common/
il21946
Run the game from this folder making a new shortcut to the IL2fb.exe
You will find most online pilots here at the Hyperlobby >
http://hyperfighter.sk/download-file-18.html