Hi Wul 799
I would suggest you to try downloading the Windows Installer Cleanup utility and run that to remove the leftover ITunes installer files that may be causing issues with your current installation.
You may refer the following article to download the Windows Installer Cleanup Utility:
Click on Start > All Programs and then click Windows Install Cleanup; the Windows Installer Clean Up Utility window appears, listing software that is currently installed on your computer.
Select iTunes from the list and click Remove. If you have multiple iTunes files, remove all of them.
Once you have completed the above steps to Empty your Temp directory, Completely remove iTunes and QuickTime, and Clean up iTunes installer files on the computer, you can install the latest version of iTunes.
You may refer the below mentioned links.