Not sure about that either. All I know is that it's possible to choose DX9 or 10 when starting Crysis. Something like right-click icon> "run in DX9", or perhaps under properties. I have Arma running on Win7 RC, with DX9 installed as well. Now that I think about it, Arma doesn't support DX10 as far as I know. I'd give installing DX9 a shot; it won't mess up DX10, so it's really quick and painless to test.
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