downloading songs to mp4
 

I have a compark s4 next generation mp4 and am having real trouble working it. I downloaded the user guide from here, but it hasnt helped. I purchased some songs from tescos downloads (legal site) and saved them to my music in my doc. then saved them to the mp4, cannot play them at all comes up with format error and if i try to play them on my computer it comes up with server error in '/drm server'. i have absolutely no idea what any of this means. I cant even work the blinking machine and wish I had just kept my walkman!!!