I got an error "File ... cannot be loaded. The file ... is not digitally signed. The script will not execute on the system. Please see "get-help about_signing" for more details.." when starting PowerShell today, after installing the new Windows SDK.
So, I scrambled to find a solution on how to make a certificate and sign it to a PowerShell script. On Scott Hanselman's Blog: http://www.hanselman.com/blog/SigningPowerShellScripts.aspx
he shows a easy to follow step by step on how to do so.
I also had to rest my Home directory.