Its really easy to know what headphones to use. use i-pod headphones LOUD THE BETTER!

I have a problem when i download i doser 4.5 it says when its done the donwload i click it and than i say run, than it loads blah blah blha Than a notice pops up and says Invalid Data So i cant do i doser can anyone figure out whats wrong . i know its not my computer cuz i tryed it on my friends too...