Default SD Card Not Working

Hey,

I backed up my whole system via CWM to my SD card while I was trying a new ROM out. When I went to restore there were no back-ups found? I checked my phone memory as well as my SD card and found absolutely nothing. Thee is also another thing, when I move music to my SD card it won't play but when I move it to the internal memory it play fine?
Is my SD card faulty at all? Would a reformat sort it out?

Edit: Also when I take a picture, the picture will be unsupported format and I can't view it on my computer either?