How did you uninstall itunes? If you run into an error, or your computer while your itunes was installing, it could leave things behind messing up all the other installations as well. What you need to do is first of all make sure you don't have any instances of itunes open, or trying to be opened. Then you can go ahead and run the uninstaller on itunes.
Then you will need to go into explorer (windows+e, or right click on your My Computer icon and press "explore" from the menu), navigate to C:\Program Files\ and delete the itunes folder completely. If you get an error saying something to the effect of "This file/folder is being used by another program, please stop that program and try again." go ahead and restart your computer, and try to delete the folder again when your computer comes back up.
Then try and reinstall it, making sure that you are downloading the correct version of itunes for your operating system.
I was so excited after reading your advice and tried it. My computer is still doing the same thing and won't let me install itunes. :( Mine has Windows 7 and I downloaded the correct form. This makes me sad.
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