The current versions of Windows Vista and of Windows Server 2008 do not support the Message-Signaled Interrupts mechanism on a VIA processor. When you install the VIA processor, these operating systems cannot use the Message-Signaled Interrupts feature.

For example, you have both a VIA Nano CPU and an ATI PCI-E VGA card installed on a computer that is running Windows Vista. After you enter the system and you check the MSI Enable bit in the ATI PCI-E VGA card, you find that the bit is always set to 0 unexpectedly.

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