Okay here is what you need to do:Step 1:
Download the Windows Installer CleanUp utility installer file (msicuu2.exe). CLICK HERE
to downloadStep 2:
Doubleclick the msicuu2.exe file and follow the prompts to install the Windows Installer CleanUp utility. (If you're on a Windows Vista or Windows 7 system and you get a Code 800A0046
error message when doubleclicking the msicuu2.exe file, try instead right-clicking
on the msicuu2.exe file and selecting "Run as administrator
Step 3: In your Start menu click All Programs and then click Windows Install Clean Up. The Windows Installer CleanUp utility window appears, listing software that is currently installed on your computer.
Step 4: In the list of programs that appears in CleanUp, select all iTunes entries and click "Remove", as per the following screenshot:Step 5:
Quit out of CleanUp, restart the PC and try another iTunes install.
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