Hello and welcome to the forum. When sharing any kind of code or error messages it’s helpful to use the “Preformatted Text” option from the toolbar to make everything more readable and maintain formatting.
Guide to Posting Code - Redux
I’m with Darwin and Olaf on this: step one is configuring PS Remoting on the Win8.1 machine. PS remoting is not a “default on” thing and requires configuration.
Being that it’s definitely not on, I’m confused by this part of your post:
What do you mean by “login-screen”? Like a graphical desktop login screen? Or a terminal based login prompt? PowerShell remoting is an entirely CLI experience so I’m confused by this.