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ITsVISTA KB-Link: KB959453

On a computer that runs Windows Vista or Windows Server 2008, a PCI Express bus may run in PCI compatibility mode instead of in PCI native mode after the PCI root bus restarts

On a computer that runs Windows Vista or Windows Server 2008, a Peripheral Component Interconnect (PCI) Express bus may run in PCI compatibility mode instead of in PCI native mode after the PCI root bus restarts. For example, the PCI root bus restarts when you disable and re-enable the root bus in Device Manager. Therefore, all PCI Express-related functionality, such as Windows Hardware Error Architecture (WHEA) and power management, is turned off.

There is a download that resolves this issue. See Hotfixes for details.
32-bit Download: Contact Microsoft
64-Bit Download: Contact Microsoft

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB959453.

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