AppleApplicationSupport.msi "not available"?

AppleApplicationSupport.msi isn't available

Usually that sort of message means the file is damaged rather than unavailable. If there's a problem with the .msi for a program, Windows isn't able to uninstall the previous version of the program. (There's an updated version of Apple Application Support in the latest iTunes installer bundle, and the previous version of AAS needs to be uninstalled prior to the new one going in.)

Quit all of *iTunes, QuickTime and Safari* first (if you have any of them open). (They all use Apple Application Support, and will interfere with the uninstall if they are still open.)

Using a different browser than Safari, download and install the Windows Installer CleanUp utility from Microsoft:

[Description of the Windows Installer CleanUp Utility|http://support.microsoft.com/kb/290301]

Now run the utility ("Start > All Programs > Windows Install CleanUp"). In the list of programs that appear in CleanUp, select any *Apple Application Support* entries. Quit out of CleanUp.

Now download a copy of the iTunes installer from the Apple website (It won't be possible to use Safari at the moment):

http://www.apple.com/itunes/download/

... and try another iTunes install. Does it go through properly this time?

Thank you for your message. I tried it but unfortunately it did not solve the problem for me. I cannot use, update, or remove iTunes and get the same message as the original poster in this thread did.