dx 10

how can i change from dx 10 back to dx9 i have herd talk of unchecking from one to the other but how please help
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thanx mr wingo im using a ati radeon 9800pro with 256 ram and xp pro so dx10 is not my problem i will have to keep on thinking all my add ons have dodgy props and cockpits(vc mode) since instaling acceleration
thanx mr wingo im using a ati radeon 9800pro with 256 ram and xp pro so dx10 is not my problem i will have to keep on thinking all my add ons have dodgy props and cockpits(vc mode) since instaling acceleration
I don't think the Radeon 9800 series supports DX10