Neccesary commands to get vmware vsphere power cli scripts runnign in power cli;
(post installation of vsphere power cli extensions)
Set-ExecutionPolicy RemoteSigned
Set-PowerCLIConfiguration -InvalidCertificateAction “Ignore” -Confirm:$false
http://blogs.vmware.com/vipowershell/2011/06/back-to-basics-part-1-installing-powercli.html