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.

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