In the future, I advise that you transfer the files from the camera (either by USB connection with the camera or by a device that will read your SD card) directly to the computer drive. Once confirmed that the files are in a single folder, you can feel safe about transfering them to a storage device, like a flash drive, so that they can be conveniently carried about. The original files should remain on the computer drive.
I think you should get another SD card because from where I'm sitting, I'm not sure what's going on with your card or camera. It might be necessary to replace your card and it might be necessary to repair your camera. I have no idea. First things first. Protect your pictures.
