itunes: program error need help

i have small problem wont let me download itunes. all my music is in itunes none of already existing progama or software options let me play my music. is their a progama or software that i can use to bypass this. i tell to download. then when oping file in Archive Manger. it say this-
                                     Archive: /tmp/iTunesSetup.exe
                                      [/tmp/iTunesSetup.exe]
                                        End-of-central-directory signature not found. Either this file is not
                                         a zipfile, or it constitutes one disk of a multi-part archive. In the
                                           latter case the central directory and zipfile comment will be found on
                                            the last disk(s) of this archive.
                                             zipinfo: cannot find zipfile directory in one of /tmp/iTunesSetup.exe or
                                              /tmp/iTunesSetup.exe.zip, and cannot find /tmp/iTunesSetup.exe.ZIP, period.

is there something im doing wrong im runing on the current version of ubuntu. has increased my computers speed very much took hours to turn on and then load operating system. i have a Microsoft@ Windows@XP designed by Dell. I'm not much experiance with computers. i know how to use them. my teacher in math told of ubuntu. so then i downloaded it. My parents come to me for help with computer.

a little about self im 18. im current doing my senior year in high school. never took a computering class till this year and that is to get certifed in microsoft excel, word, and possible powerpoint. so far started excel. the version where wooking on is 2008. can someone help me please.