How to enable execution of user defined powershell scripts

gistfile1.ps1

#Create file with instructions and save as script.ps1
Write-Host "Hello, World!"

# Open cmder or CMD as Administrator (right button click > Open as administrator)
λ powershell
Windows PowerShell
Copyright (C) 2009 Microsoft Corporation. Reservados todos los derechos.
PS> Set-ExecutionPolicy RemoteSigned
#Close program

#Open a new instance of powershell (same as before) and navigate to the script.ps1 folder
PS> & ".\script.ps1"
Hello, World!