iTunes Windows 7 64-bit Edition
There is new version of iTunes for both the 32-bit and 64-bit of Windows 7, which can be found on the main website for the program. The new version of the program, as of this writing, is 10.0.1.
On the left hand side, above the big blue 'download' button, are four different options. The first is whether you would like to download iTunes for the 32-bit versions of either Windows XP, Windows Vista, or Windows 7; the second option is if you want to download the program for the 62-bit versions of either XP, Vista, or Windows 7. This is the option you will want to choose if using a 64-bit computer.
Depending on if you chose to run or save, the download will be complete. In either case, Windows 7 will ask if you want to install the program. Hit OK and iTunes will start installing. Half-way through the installation, Windows 7 may again ask if you want this program to install (this is most likely for iTunes itself, as the download is for both Quicktime & iTunes), again say yes and the install will start again.
If everything goes right, both iTunes and Quicktime will be installed on your computer. You will then be able to set up the program.