I don't see a problem, it says your computer can't play the HD version so its offering you to buy the standard definition version.
It can and thats the problem
Get Netflix, saves so much money.
how big is your screen
this, but if your going to have music use itunes
what are you talking abouthttp://spotify.com
if he listens to music he should use itunes
Why do people really need music on the go though? YouTube has the widest selection of music you can get, and it's free. Grooveshark is another option.
If you bought the HD version why wouldn't it throw in SD for free....