Allow scripts to be run:
Set-ExecutionPolicy RemoteSigned

Set back to default setting:
Set-ExecutionPolicy Restricted

ExecutionPolicy parameter values:
Set-ExecutionPolicy [-ExecutionPolicy] <ExecutionPolicy>
	Specifies the new execution policy. The acceptable values for this parameter are:
	-- Restricted. Does not load configuration files or run scripts. Restricted is the default execution policy.
	-- AllSigned. Requires that all scripts and configuration files be signed by a trusted publisher, including scripts that
	   you write on the local computer.
	-- RemoteSigned. Requires that all scripts and configuration files downloaded from the Internet be signed by a trusted
	   publisher.
	-- Unrestricted. Loads all configuration files and runs all scripts. If you run an unsigned script that was downloaded
	   from the Internet, you are prompted for permission before it runs.
	-- Bypass. Nothing is blocked and there are no warnings or prompts.
	-- Undefined. Removes the currently assigned execution policy from the current scope. This parameter will not remove an
	   execution policy that is set in a Group Policy scope.