To uninstall iTunes, as Jack said, run the Revo Uninstaller. Also uninstall Quick Time, Bonjour, iPod updater and any other Apple software in the Add Remove Programs then restart your computer. Then download the latest version of iTunes.
I did that to no avail. I have been trying to do download itunes for months. My last failure cost me 199.99 to iyogi I fighting to get that back. Thanks for the try.