Ok, so you've written your own script and now you want to run it to make sure that everything works fine. So you load up Powershell and try to run it but it gives you an error saying that the "execution of scripts is disabled" on your system. Now that's not very nice. But its ok, its very easy to fix.
First load up powershell as an administrator. Then type in
Get-Executionpolicy
What is should return is a value of Restricted
Now type in
Set-Executionpolicy unrestricted
And that's it. You can type in the get-executionpolicy again just to make sure but you should now have the ability to run scripts.
