I installed iTunes a couple days ago, and the first error I got was this.
Apple Application Support was not found.
Apple Application Support is required to run iTunes. Please uninstall iTunes, then install iTunes again.
Error 2 (Windows error 2).
In case you have this problem, the error is pretty simple to solve. First, you need to have WinRAR on your PC. Then, right click on the iTunes installer, Open with WinRAR.
Once in there, right click on AppleApplicationSupport.msi > Extract without confirmation. This will extract the file in the same folder the installer is located.
Just run that file as administrator and you’re good to go.
NOTE: You need to have the Windows Modules Installer enabled (TrustedInstaller) or it won’t work.