In order for PowerShell to run scripts you need to grant it specific permissions.
- Restricted
- No scripts can be run. Windows PowerShell can be used only in interactive mode.
- AllSigned
- Only scripts signed by a trusted publisher can be run.
- RemoteSigned
- Downloaded scripts must be signed by a trusted publisher before they can be run.
- Unrestricted
- No restrictions; all Windows PowerShell scripts can be run.
Get-ExecutionPolicy
set-executionpolicy remotesigned
Reference: https://technet.microsoft.com/en-us/library/ee176961.aspx