Why isn't my iTunes download working?

I want to update my iTunes to the new version but before the download is even halfway over it says that it can't find iTunes.msi and that I have to locate it. I've searched for this file for about a week now. I even had my computer search for it. It's not on here. Should I delete iTunes from my computer and then try downloading it again? I don't want to lose all of my music that I uploaded from CD's though. HELP ME!