How do you put music on the gigabeat

[dmanbass1]

I tried to use windows media 10 but the instructions are very bad. I made a play list and tried to sync it with my device it wouldn't work! After i tried just using "My computer" on windows. I found the right device and opened the following folders and simply dragged the music in and it worked but the next day i turned it on and error "4" popped up and deleted all of my media!!


Please Help