When trying to install the System Center Virtual Machine Manager 2008 Administrator Console, it may fail during the Prerequisites Check with error message: To continue, you must complete all prerequisites. Resolve all error conditions listed below and the click Check Again. For more information about required configurations, see Virtual Machine Manager System Requirements. System Center Virtual Machine Manager requires Windows PowerShell 1.0 or 2.0.  Resolution: KB974887 - Error message when trying to install the VMM Admin Console: "System Center Virtual Machine Manager requires Windows PowerShell 1.0 or 2.0"