Originally Posted by ubertuber

Actually, that reminds me of something: there's no problem with iTunes and 64-bit version -- just download the correct one from the apple site. But check your browser first. Apparently some (most?) versions of firefox are unable to handle the 64 bitness and automatically truncate down to 32 bits without telling you. Because of this, the installation of iTunes will give all kinds of strange behavior. Download again and install using a browser that can handle 64 bits and you'll be good to go.

I can't imagine how frustrated someone had to be to figure that one out.