Error message installing Chocolatey in PowerShell

You must start that line from cmd.exe (a "standard" command prompt), not from PowerShell.

In PowerShell v3+ the easiest way is:

1. Open a PowerShell window (run as administrator)

2. Check the version of PowerShell is greater than 3:

    $PSVersionTable.PSVersion

3. Enable execution of PowerShell scripts?

   set-executionpolicy remotesigned

4. In PowerShell

   iwr https://chocolatey.org/install.ps1 -UseBasicParsing | iex

I was unable to install Chocolatey on my Windows 10 64-bit OS installation. I was getting powershell not recognized as internal or external command. Finally I found the solution, so to people who ever facing the exact same problem as I did, here is the solution for you.

The reason why you get such an error is because the WindowsPowerShell path is not set. So kindly set the Path as

%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\

Go to Environment variable (see below). You see that Path variable, click on Edit and you see one more pop-up window, which shows a couple of paths there. Now click on New and copy-paste the above path. Close your CommandPrompt(admin) and open it again. Run the command given by Chocolatey, and now it starts downloading.

Here is a step-by-step guide:

Go to Control Panel → System → Advanced System Settings → Environment Variables → User variable for Users → Select Path Variable → click Edit → Click on New → paste this %SYSTEMROOT%\System32\WindowsPowerShell\v1.0\ → Click OK → you're done.