Command Prompt: access denied when run PowerShell

My problem was that C:/windows/system32/powershell.exe was invalid as you can see on the image below:

I could found the right executable in C:\Windows\System32\WindowsPowerShell\v1.0\.

So if this is your problem, try the following:

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe .\my-script.ps1

Instead of this:

powershell.exe .\my-script.ps1

CodeHunter