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Resolutionįor more information about how to download the hotfix for Windows 7 SP1, Windows Server 2008 R2 SP1, or Windows Embedded Standard 7 SP1, click the following article number to view the article in the Microsoft Knowledge Base:Ģ922223 You cannot change system time if RealTimeIsUniversal registry entry is enabled in Windows This behavior occurs when the RealTimeIsUniversal registry key is configured. This issue occurs because the hardware abstraction layer (HAL) uses the CMOS clock time incorrectly, and this causes a conflict. The CPU usage remains at 100 percent until both the clock on the host computer and the Windows clock on the virtual machine pass the DST changeover time. In this scenario, the virtual machine uses 100 percent of CPU resources. The virtual machine and the host server start the DST changeover. You configure a DWORD type registry key named RealTimeIsUniversal in the following path on the virtual machine, and set the value to 1: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TimeZoneInformation

You change the time zone of the Windows clock on the virtual machine to a local time zone.Īfter you restart the virtual machine, the Windows clock on the virtual machine does not reflect the local time zone, and is instead set to the UTC time zone. The clock on the host server that runs the virtual machine is set to the UTC time zone. You deploy a Hyper-V virtual machine that is running Windows Server 2008, Windows 7, or Windows Server 2008 R2. The CPU usage remains at 100 percent until both the CMOS clock and the Windows clock pass the DST changeover time.

In this scenario, the computer uses 100 percent of CPU resources. The computer starts the daylight saving time (DST) changeover. The CMOS clock does not match the Windows clock. You configure a DWORD type registry key named RealTimeIsUniversal in the following path, and set the value to 1: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TimeZoneInformation You configure the complementary metal-oxide semiconductor (CMOS) clock according to Coordinated Universal Time (UTC). You have a computer that is running Windows Server 2008, Windows 7, or Windows Server 2008 R2. Windows Server 2008 Datacenter Windows Server 2008 Datacenter without Hyper-V Windows Server 2008 Enterprise Windows Server 2008 Enterprise without Hyper-V Windows Server 2008 for Itanium-Based Systems Windows Server 2008 Foundation Windows Server 2008 Standard Windows Server 2008 Standard without Hyper-V Windows Server 2008 Web Edition Windows Server 2008 R2 Datacenter Windows Server 2008 R2 Enterprise Windows Server 2008 R2 for Itanium-Based Systems Windows Server 2008 R2 Foundation Windows Server 2008 R2 Standard Windows Server 2008 R2 Web Edition Windows 7 Enterprise Windows 7 Home Basic Windows 7 Home Premium Windows 7 Professional Windows 7 Starter Windows 7 Ultimate Mehr.