When I put it in the Dvd drive. Nothing shows up on it. Can anyone help. I know alot of people don't like vista, I love Xp but I need vista For school. Please help. I have cleaned the entire computer inside out. I have also removed all documents and Photos and Music. Please please help.

the answer is by Οραγλε Δελφοί (Oracle of Delphi) :
hate to trivialize your issue, but it might be as simple as your computer may not have a DVD drive. it may read CD's fine, but not DVD's.
install a DVD drive (they're about $40 and extremely easy to install by yourself because you don't need to install any software) and you should be good to go.