[Anonymouse]

Thanks, guys.

Things seem to be okay now - I managed to copy the contents of the folders to another stick, then deleted the originals and recopied them, so they're now showing as they should. I can't figure out where the damn thing came from, though, as I only use the stick in the library - the computers are very restricted there, understandably, and I never visit sites that are even slightly dodgy, so it's a bit of a puzzle. Oh well.