reinstall it but it'll leave your music alone of that's your concern (music is located elsewhere). First, open Explorer and see if there's a folder in Program files called iTunes. If it's there, remove it. Then download iTunes and save it. Do not use the auto-run/auto-install.
I have got an issue with the iTunes installer...I tried firstly to install the new iTunes from software update and it said it couldn't do it and recommended that i do it manually, however when I tried doing this the installer said that the "folder path program files contains an invalid character" and after that it finishes and says that it couldn't install iTunes.....I have no idea what to do about this....i tried some of the steps on apple itunes support page....but that hasn't worked...i really don't want to have to uninstall iTunes completely and then have to install it again....