M6600 USB Port not working

I have recently been given a laptop, which is great, but I need all four of the USB ports to work, which currently, only the two on the Left Hand side of the machine do (it's the two on the Right Hand side that don't). I've ran both Windows and Dell diagnostics which tell me that the driver need updating. However, when the update is complete, the drivers won't install and the RH USB ports still don't work. In Device Manager, there is an "Unknown device", which I assume is the offending item.

Any suggestions would be greatly appreciated.

P.