Extra Users?

[aceldama]

I am setting this up for the first time, and it all ran smoothly, except in "Select User," it found two accounts. Mine, and someone named Plon. I have no idea who this is, or why the profile would be found on my machine. Literally not a single other person has ever used this machine. And not a single other person in the network has ever used Steam, either.

I can just choose my "real" account, which is listed, but I am more concerned at figuring out why this other profile is on my machine than just ignoring it.