I get this when running the game on W7 64-bit. Despite the message, the game runs fine.
DxDiag
I get that message with GalCiv2: Twilight... also on Win7 64 bit
This is a bug with the Windows 7 RC, as someone who has the final, I can confirm it is fixed.
There is a partial bug fix floating around on the net using a vista version of dxdiagn.dll, as well. But that does screw up dxdiag...
As noted, this is a Windows bug that is fixed in RTM/Final.
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