Have you tried running any other games besides IL-2? Do they exhibit any of the same behaviors? Are all of your system drivers up to date, especially your video card drivers?
One thing to be sure of, when you uninstall the game to "clean it out" and start over fresh, make sure you delete the residual old directory before reinstalling. Also! Be sure NOT to install to C:\Program Files or Program Files (x86), if running Vista or Win7! Most older games have real problems when installed there due to UAC issues.
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