Try systemRestore [ found in Control/system]
and et t to a time when the USB camera was last seen.
If you hsave camera software installed - delete it.
Then plug in the cam. The puter should recognise it as an extra drive on in my computer,[ If you are a- c- d forcexapnle then it will be drive E
or the next one to the current last letter if you see what I mean. try that first then we will get techical. A for the player just download it the latest.