IPhone – Someone else’s phone automatically shows up in the iTunes

Someone else had updated their iPhone on my computer in the past, and now every time I open iTunes, it automatically shows their phone in the Device column and not my own (when neither their phone nor my phone is plugged into the computer). How can I stop this from happening? How can I make my friend's phone disappear from my iTunes completely? I have already wiped iTunes off my computer, and reinstalled it, but this problem still occurs.