Rule “Windows PowerShell” failed while installation SQL Server Denali

If your system does not have Windows PowerShell 2.0 installed, then Denali setup will fail with below error:

Windows PowerShell 2.0 is not installed or enabled. To continue, please install or enable Windows Powershell 2.0.

To resolve this problem, you have to install Windows Powershell 2.0 using below steps:

Go to http://support.microsoft.com/kb/968929 and download appropriate version of Windows Management Framework Core for your server.

Please note this will need a restart of your server.