BTW: AH doesn't have a demo version, you have the FULL program. You won't even be asked for a credit card number until your 2 weeks are up. Even if you don't decide to sign up, you can still fly offline and head to head forever free of charge.
Once you fix that video problem and try out the game, try customizing your gunsights and sounds. (AK Wabbit's sounds are very good, and can be found on the downloads page. There is the main file, then a patch that adds even more sounds.) If you have any .wav files from other games that you would like to use, all you have to do is place them in a subfolder of your sounds directory. Just name your folders p51d, c205, 109g10, typhoon, etc. Then just rename the sounds to match those in the main sounds folder. eng.wav, drop.wav, gear.wav, stall.wav, etc.
Gunsight customization is done in a similar fashion, just modify the default sight in paint and then save it as p51d.bmp, etc.
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bloom25
THUNDERBIRDS