If it comes back advise, as there are basically 3 files that drive USB and one could be corrupt. But if all is working and its gone for now, just leave it alone.
For reference the 3 files are:
C:\Windows|system32\drivers\usbstor.sys
C;\Windows\inf\usbstor.inf
C:\windows\inf\usbstor.pnf
But I would not mess with them, if your curious you can look and see if you have them, just don't mess with them.
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