My guess is that the cards are being infected by one or more of the public computers you are plugging them into.
I tried using another card and that one did in fact talk to the computer for a day or two but now it is having an identical problem.
That quoted text is what tells me that.
Your camera isn't infected the cards are.
You will need to be sure that autorun is disabled on Your computer when you get home before you plug the card in, then virus scan it.
The easiest method for now is not the least expensive. If I were you I would fill up a memory card and then store it for later retrieval at home. Then put the next new card in the camera until it is filled, Repeat until home. More or less as if you were using a film camera and changing rolls of film until they can be developed.
I would never plug anything that is or has removable storage into a public computer, Nor would I do anything financial over one. Nothing involving passwords either. As you have found out some of them are infected and who knows what they are looking to steal from users.
Of course this is also why in some ways film is better than digital for cameras.
Edited by rotor123, 26 July 2012 - 10:08 AM.