Unable to reinstall iTunes because of Apple Mobile Device, please help :(

About two days ago I got the latest iTunes update and when I tried to update, my iTunes stopped working and the error was something about Apple Mobile Device. Since then I've been fighting with this issue, I have uninstalled and installed iTunes (and everything related to Apple), I've restored my computer over and over again. Nothing I do ever seems to work. I am going just crazy without my iTunes!
I'd be so thankful if someone can help me!

"A newer version of quicktime is already installed. This installation cannot proceed while the newer version of quicktime is installed"
Unfortunately, this sort of trouble has gotten more complicated to deal with ever since Microsoft pulled the Windows Installer CleanUp utility from their Download Center on June 25 2010. First we have to find a copy of the utility.
Let's try Googling. (Best not to use Bing, I think.) Look for a working download site for at least version 3.0 of the Windows Installer CleanUp utility. (The results from mydigitallife and Major Geeks are worth checking.)
After downloading the utility installer file (msicuu2.exe), scan the file for malware, just in case. (I use the free version of Malwarebytes AntiMalware to do single-file scans for that.)
If the file is clean, to install the utility, doubleclick the msicuu2.exe file you've downloaded.
Now run the utility ("Start > All Programs > Windows Install Clean Up"). In the list of programs that appears in CleanUp, select any QuickTime entries and click "Remove".
Quit out of CleanUp. Restart the PC, and try another QuickTime install. Does it go through properly this time?

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