receiving non-audio, corrupt files, media usage etc

[ronhubbard]

longtime limewire user, windows xp
i have been receiving many files which are not mp3 audios, yet they say they are and show audio icon before i download. after, i download them and almost half corrupt and end up showing an icon which looks like a disk (has purple bar across top, light blue and red shape below). i dont know what type of files these are. when i try to play them i get message on windows media player about "media usage rights." by "coolpixhost.biz". This all seemed to begin after i downloaded itunes, which changed all my mp3 files to their icons. i have uninstalled, but the corruption and the weird files keep coming. am i just receiving non-audio files from other peers? did itunes install something which now makes files non-audio or no access because of rights? How do I receive normal mp3 audio files again, some are ok but about half are corrupt and show weird non-audio icon? help!