Also DO NOT install il-2 to the default location. If you have User Account Control on it won'tlet you edit any files, or if you choose t tune your conf.ini it won't let you save the changes.
Be sure to turn UAC off in the user control page (from control pannell) and when you install il-2, point it to a different location, eg in your 'my computer' make a file called il-2 or something, and install it there.
I hope this make sense