Thank you very much for the post! I was having trouble with a Renesas USB 3 card in that it would work when I passed it through to a Windows 7 VM, but it wouldn't work when I passed it through to a WinXP VM. When I set pcipassthru0.msiEnabled to False it worked just fine under WinXP. I went and set it that way on the Windows 7 VM and it still worked there too.
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