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"Product: Microsoft System Center Virtual Machine Manager Agent — WS-Management service is either not installed or disabled. Verify that Windows Hardware Management is installed and the Windows Remote Management service is enabled. Refer to the FAQ for more information."

You should install the KB 936059.  This update adds a new feature to Windows Remote Management (WinRM). This update also updates the version of Windows Remote Management that is included with Windows Server 2003 R2

Post-installation instructions

On a Windows Server 2003 R2-based computer that has the Windows Hardware Management optional component installed, the WsmanSelRg collector-initiated subscription collects events form the BMC. This subscription has a URI property that is set to wsman:microsoft/logrecord/sel. After you apply this hotfix, the WsmanSelRg subscription will not work until you set the URI property to the following:

http://schemas.microsoft.com/wbem/wsman/1/logrecord/sel

To set the URI property, run the following command at a command prompt:

wecutil ss WsmanSelRg /uri:"http://schemas.microsoft.com/wbem/wsman/1/logrecord/sel