I had the exact same problem a few weeks ago when I was trying to update my iTunes to 10.7. Now the new version is out and the version downloadable is NOT compatible with Vista 32-bit, as the download page indicates.
Anyone know the link to the 32 bit iTunes 11.0?
Updating from iTunes fails. I thought it was because of my connection at home, but now I suspect it's because the version is incorrect.
I need to download it outside of iTunes and install.