That screenshot shows corrupted content. You can:
- reformat the SD card in the phone, then try copying media back to the SD card when the phone is connected to your computer (or use a wireless file transfer solution like AirDroid or any of the bazillion similar apps); if you go the direct connect route you can try using the Kies software to manage the files
- forget that SD card (it'll probably always give you problems) and try a different one
- try an app like SDFormatter
https://www.sdcard.org/downloads/formatter_4/ and format the SD card in your computer (you may have buy an SD writer - you can get reliable ones for under $10)
- skip SD cards altogether - they have been very problematic for some people, particularly with lots of media files (I had a 64GB SDXC completely corrupted so that it was unrecoverable even on a PC - YMMV)
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