I moved files from a computer to an SD card, then the files were GONE off of the SD card!! 10 POINTS!!?

This is something that usually happens with SD cards called corruption As far as restoring the files there are programs for that available next on the internet for free. Also next time use some sense You can get a $50 dollar TERABITE external BACKUP DRIVE from tigerdirect.com. Cheaper and built for your specific purpose.