HTC One M7 :: Phone Unable To Sync To PC Via Manager - Find / Update Drivers

Basically my original HTC One got quite damaged, and so I bought a slightly used unlocked version (one where the screen and case wasn't near destroyed, as my original). However, since getting the phone I have constantly been trying to hook it up to PC via USB cable in order to, simply, transfer some music. My computer will not recognise my new phone as a htc (only "Android Phone"). It will also not allow me to find (automatically/manually) the drivers.

Now this is pretty much the same problem with both phones, so I highly doubt it is a fault with the new one I just purchased. I have tried multiple usb ports in my computer, searched the entire internet for answers, downloaded drivers and manually tried to find them to no avail, uninstalled/reinstalled the sync manager numerous times but it still will not find the phone. I cannot understand this at all. It's always been as easy as, attaching a usb cable and then even using WMP to sync music files, or even drag them in manually. But my computer will not recognise any HTC one, or allow me to find the drivers.