Not having used an ADVC-100 before, I was just wondering does it have any inbuilt codecs of it's own and maybe the same one on your computer was deleted? It's difficult to keep track of every file on your system. Try searching Google or one of the other search engines to see if it has either a Firmware or driver update available by all means.

__________________
Better than a poke in the eye with a pointy stick any day...