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Apple Application Support is where single copies of program files used by multiple different Apple programs (iTunes, QuickTime, Safari, the MobileMe control panel, and Apple Mobile Device Support for example) are stashed.

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Apple Application Support, free download. Apple Inc.: Audio & Multimedia.
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Let's try a standalone Apple Application Support install. It still might not install, but fingers crossed any error messages will give us a better idea of the underlying cause of the issue.

Download and save a copy of the iTunesSetup.exe installer file to your hard drive:

Download and install the free trial version of WinRAR:

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Right-click the iTunesSetup.exe, and select 'Extract to iTunesSetup'. WinRAR will expand the contents of the file into a folder called 'iTunesSetup'.

Go into the folder and doubleclick the AppleApplicationSupport.msi to do a standalone AAS install.

Does it install properly for you? If so, does iTunes launch properly now?

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If instead you get an error message during the install, let us know what it says. (Precise text, please.)

Nov 29, 2011 2:51 PM