I can't figure out the problem with my mp3/mp4
 

I got my mp3/mp4 player Sunday, two days ago. It's a ipod nano clone, color green, 1 GB, SDK: V35.37. I was never able to install the disk that came in it. Also, when I had stored songs in the player, which wasn't much, like 26 songs, it leaves out the last four songs. It plays 22 of the 26 songs I have in it. This is really annoying me, and stressing me. Can anyone please help me? :(