how to create a context menu using powershell

Hi 

i would like to create a context menu for powershell but i am getting an error after powershell menu is created

"This file does not have a program associated to it. i am using this script . I am trying to create a powershell shortcut on folders."

also once it gets created i would like to open powershell as admin always

New-PSDrive -Name HKCR -PSProvider Registry -Root HKEY_CLASSES_ROOT
Test-Path HKCR:\Directory\shell\Powershell
New-Item -Path HKCR:\Directory\shell -Name Powershell
Set-Item -Path HKCR:\Directory\shell\Powershell -Value "Open Powershell Here" 
New-Item -Path HKCR:\Directory\shell\Powershell\key -Value "C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe -NoExit -Command ""Set-Location -LiteralPath '%L'"""