Problem with my SD card

Hello,
Thank you all in advance for any help in this matter. I just turned on one of my camera's that I have not used in about 1 1/2 years. I inserted a SD card that is about the same age and has been inserted in my laptop for about the same time. When I inserted the SD card in my camera it asked for me to format the SD card, so I did. I took some pics and then went to download them onto my laptop. Before I did I checked that the images had been recorded onto the SD card, they were. As I tried to download them my laptop could not find any info on the SD card. I tried 3 different software programs; the one that I installed from the camera manufacture, Adobe Photo Downloader and the windows software. All said basically the same thing no info to retrieve. I then went back and re-inserted the SD card back into the camera to see if I had lost the images but I had not. I was able to review the images through the viewfinder. Could it be the SD card, computer or camera. The camera is a Panasonic Lumix DMC-FZ30 in case that matters.
If anyone has any suggestions I'd appreciate the help.

Kind regards to all.