Change or Set ExecutionPolicy to Enable PowerShell Scripts to Run

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I know that it is more secure to allow only signed scripts to run, but this sript from Micrososft allows you to write your own PowerShell scripts and actually run them with ISI.

Script needs to run as System user

<#
================================================================================
========= Introduction to Change-ExecutionPolicy.ps1 =======================================
================================================================================
Name: Change-ExecutionPolicy
Purpose: Allow User/Administrator a way to execute multi-line scripts
Author: Dan Stolts – dstolts@microsoft.com – http://ITProGuru.com
Syntax/Execution: Copy portion of script you want to use and paste into PowerShell (or ISE)
Description: Shows Multiple ways to change PowerShell ExecutionPolicy
Disclaimer: Use at your own Risk! See details at ITProGuru.com
Limitations:
* Must Run PowerShell (or ISE) as an Administrator
* UAC may get in the way depending on your settings
================================================================================
#>
# Run PowerShell as Administrator

#Set Remote Execution to: untrestricted
Set-ExecutionPolicy Unrestricted
Get-ExecutionPolicy

#Set Remote Execution to: untrestricted
Set-ExecutionPolicy RemoteSigned
Get-ExecutionPolicy

# You can also Run PowerShell in Different Execution Policy
powershell.exe /?
# -executionpolicy bypass
# -windowstyle hidden

#############################################
## Now Let’s See how to do it with older versions of PowerShell
#############################################

#Set Remote Execution to: unrestricted
$MyPath = Get-Location #Set the default value for path
$WritePath = $MyPath.ToString() + “\PowerShell-Execution-Unrestricted.reg”
Write-Host “Creating” $WritePath -ForegroundColor Green
$SaveFile = ‘Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PowerShell\1\ShellIds\Microsoft.PowerShell]
“ExecutionPolicy”=”Unrestricted”‘
$fso = new-object -comobject scripting.filesystemobject
$file = $fso.CreateTextFile($WritePath,$true) #will overwrite any existing file
$file.write($SaveFile)
$file.close()

Write-Host “Finished” (Get-Date) -ForegroundColor Green
Regedit /S $WritePath
Get-ExecutionPolicy

#############################################
## Now RemoteSigned
#############################################
#Set Remote Execution to: RemoteSigned
$MyPath = Get-Location #Set the default value for path
Write-Host $MyPath “will be used for creating registry files. You must have write permissions” -ForegroundColor Yellow
$WritePath = $MyPath.ToString() + “\PowerShell-Execution-RemoteSigned.reg”
Write-Host “Creating” $WritePath -ForegroundColor Green
$SaveFile = ‘Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PowerShell\1\ShellIds\Microsoft.PowerShell]
“ExecutionPolicy”=”RemoteSigned”‘
$fso = new-object -comobject scripting.filesystemobject
$file = $fso.CreateTextFile($WritePath,$true) #will overwrite any existing file
$file.write($SaveFile)
$file.close()
Write-Host (Get-Date) -ForegroundColor Green
Regedit /S $WritePath
Get-ExecutionPolicy

Source: TechNet Change or Set ExecutionPolicy to Enable PowerShell Scripts to Run