iPhone doesn't show up under 'Devices'

[user-removed]

I used to use my iPhone 4 with Spotify, and it worked great. A couple months ago I got the iPhone 5 and after setting it all up I found it would not show up under Devices in Spotify while plugged into USB. I do not have a wireless router here (bit of a weird setup, living in an apartment where phone lines are not available).

Anyway, the iPhone 4 worked great over USB but I just cannot get my iPhone 5 to show up in Devices no matter what I do. Spotify is in the Windows Firewall exceptions, I have reinstalled Spotify on my computer, I have re-downloaded the app on my iPhone and it will not show up.

I recently got given an FM transmitter for iPhone 5 and would love to be able to use it in the car.

I am a Premium member, just in case you were wondering.