This option is to remove other programs linked to iTunes and necessary for their operation. You have to go to Control Panel and uninstall the following program, very important, you must follow the same order as you indicated:
iTunes
Apple Software Update
Apple Mobile Device Support
Bonjour
Apple Application Support 32-bit *
Apple Application Support 64-bit *
* On some computers, you may have installed two versions of the Apple Application Support. It is common and if you're both, you must uninstall all.
Once you have completely uninstalled iTunes, it is important to restart the computer and that you download the iTunes program again to install the latest, the most current version.