the kiosk shouldn't of wiped anything off the media. Its a possibility that someone used a "dirty" card in the kiosk infecting it. By "dirty" I mean that it could of been infected with some strain of virus/worm/trojan. When they used it, because it reads the ENTIRE contents of the card, the dirtyness of the card was transferred to the kiosk... This happened to my wife's micro SD card from her phone. SUCH a pain in the A$$. I don't trust public computers. They are kind of like public toilets...
So try this.. depending on your knowledge of command based programs, open a CMD window (Start>Open Program>CMD) and try diskpart (if your using XP. if your using Crapsta AKA Vista, your out of my league...) then use the command "list volume" the USB card will have removable somewhere next to it... to the right i think.. if the size is what its supposed to be along with the filesystem (FAT32), then its funtional. That means there is a partition there and its formatted to be used.. If its saying that it needs to be formatted, try low level scanning it with your virus scanner. to at least save the card....
If you got all the data off the media, and you just want to make the card usable, just format it.. Don't "quick format" it though, that won't rid you of the culprit.. let it take its time..