As long as you don't have PowerShell active and running while you're playing, you're fine and the issue is somewhere else. PowerShell is basically a fancy CMD and COULD be used to tamper with the game and inject stuff (hacks). I'm going to go ahead and assume you didn't have PowerShell running while playing, because you'd have to be the one starting PowerShell, so that's not the issue.
Moreover PowerShell is part of Windows; as I said, it's a fancy CMD (hopefully you know what that is, you have 10k on OF, you know what that is :D) and you can't exactly get rid of it that easily.
Just in case do a Ctrl+Shift+Esc and check if its in there in the list, and if it is - Right Click -> End Task.
If this is the first time you get disconnected like so and this has not happened before while you were playing, try restarting your Computer.
If this doesn't work, check out your most recently installed apps. Most likely one of those is the problem.