Removing Powershell ver 1

Recently I have been having Powershell ver 1 popping up every time my computer starts up. I tried to delete but I am told that I don't have permission to do so, as I need permission from Trustedinstaller. I can't find that or have it work any other way. It appears to be Malware and I would expect that my Norton 360 would take care of that  but it doesn't.lease help.

https://community.norton.com/en/forums/how-do-i-remove-powershell-v1