If that doesn't do it for you, please post some information so we can try to help.
System details, you know mainboard, chip, ram, OS, DX version, video card, driver version, etc. Also it would help to be more specific about the problem. When does it lock up, what does the screen look like, etc.
Without some information, you can't expect any help.
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Lephturn - Aces High Chief Trainer
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Lephturn's Aerodrome!"Nothing is so firmly believed as that which we least know." - Michel Eyquem, seigneur de Montaigne. (1533–1592)