AVFoundationCF.dll not found? + Error 7 (Windows error 126)

About a week ago, I decided to upgrade to the newest version of iTunes. Upon trying to install the new version, it said it could not download as there was an error with quicktime. I then uninstallled and downloaded the newest version of Quicktime. The error message went away, however, now I am faced with this meassage everytime I attempt to install:
"An error occured during the assembly 'Microsoft.VC80.CRT,version="8.0.50727.4053"type="win32",publicKeyToken="1fc8b3 b9a1e18e3b",processorArchitecture="x86" Please Refer to Help and Support for more information HRESULT: 0x80073712
Then iTunes goes into "rolling back action" and 'completes' the install.
upon opening itunes, i get an error message saying that windows error 126 has occured or error 7, and that i should reinstall itunes. except i've done this six times now, so it clearly doesn't help.
supposedly the component AVFoundationCF.dll is not found, and the solution to that is REINSTALL, again, that doens't work.
What can I do?
Message was edited by: jashie

Had this problem when I tried to upgrade. I eventually uninstalled all iTunes v9 related products (iTunes, Quicktime, Apple Application Support and Apple Software Update). Then I tried a fresh install of the v10.1x setup. I get the following:
Pop up#1 (iTunes.exe - Unable to Locate Component):
This application has failed to start because AVFoundationCF.dll was not found. Re-installing the application may fix this problem.
Pop up#2 (iTunes):
iTunes was not installed correctly. Please reinstall iTunes.
Error 7 (Windows error 126)
Since I'm on XP SP3 Home Edition, I can't install the System Readiness Tool (only for Vista, 7 and Server 2008, etc.).
So I gave up and unintalled all Apple products (iTunes, Quicktime, AAS, AMDS, ASU). I then went back to an iTunes 9.0.2 installsetup.exe I have. Installed "successfully" and now when I launch iTunes I get the following error pop up:
Pop up#3:
The file "iTunes Library.itl" cannot be read because it was created by a newer version of iTunes.
What can be done now? I'd like to be on the current version, but I can't get around the first 2 pop ups with the methods I've seen posted here.

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Avfoundationcf.dll "Not Found" [FIX]

I discovered how to fix the problem of "avfoundationcf.dll Not Found" in windows xp 32 bit
You just need to Uninstall and Re-Install the 'AppleApplicationSupport"
Just go to this directory "C:\Documents and Settings\All Users\Application Data\Apple\Installer Cache\" and chose the directory "AppleApplicationSupport" with the higher version, my directory is "AppleApplicationSupport 2.1.6" Inside of this directory just run "AppleApplicationSupport.msi" and chose "Remove" when it finish run this file again and chose "Install"
It worked for me
Hope it help :]

This procedure might work or might not work:
Download the free Ccleaner and repair your Registry (repeat until clear)
http://www.piriform.com/ccleaner/download/standard
Uninstall iTunes according to Apple's directions here
http://support.apple.com/kb/HT1925
Use Ccleaner and repair your Registry again just in case.
Then download/install iTunes again from the Apple website
http://www.apple.com/itunes/
Your iTunes content will not be removed,
Please regularly backup your iTunes content to external medium (hard drive, cd/dvd's) using the File>Backup Library in iTunes. Apple will not reissue new copies of content.
(Notice: this post is a copy/paste in a hope that a uninstall/reinstall and repair of your Registry may solve your particular issue, Windows issues are particular difficult to resolve due to multiple factors, so my advice is to be taken into advisement with others recommendations which may be more specific or experienced in resolving your issue. If it or others recommendations solve your issue, please respond back with a "Correct" or "Helpful" or not resolved responses so we can further refine our efforts in trying to successfully assist others. I receive no compensation for product mention.)

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then
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AVFoundationCF.dll not found? + Error 7 (Windows error 126)

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