problem
 

when i try to preview a song it wont let me. every song that i completely download a song it still wont play, it says that it is a corupted file. what should i do????

Are you sure it's "every song" that is corrupted? How many have you dwnlded then? Chances are you have been dwnlding from the same source & all/most songs from that source are corrupt. See if you can find one from a different source; eg: get one that's a slightly different size or bitrate. See how that goes. You can filter out sources that are offering corrupt files.