The photos are accessible on the camera and can be viewed, but when I plug the camera into a computer with the cable it shows two open folders 1) DCIM (Short cut 2kb) and 2)RECYLER (Shortcut 2kb) but no photos inside it.

I have also tried using a separate USB port and also have put the card in another camera and connected to my pc/Laptop but the result is the same.

Earlier have opened the same card on the same PC and was able to access the photos on PC

is it possible that the memory stick may have a virus, and what can i do about that?

Any help will be much appreciated,
Thank you,
Mitesh Gupta