Itunes won't start, error 7, windows error 126.

After updating my itunes a few weeks ago, it now won't load and I get the following error message;
the program can't start because avfoundationcf.dll is missing from your computer. try reinstalling the program to fix this.
followed by this error messsge;
itunes was not installed correctly. pleasse reinstall itunes. error 7 (windows error 126).
I've tried numerous things including solutions posted in this forum but I can't fix it. I'm running windows 7 64bit btw. If anyone could please help that would be great, thank you.

the program can't start because avfoundationcf.dll is missing from your computer. try reinstalling the program to fix this.
Taken at face value, you're having trouble with an Apple Application Support program file there. (Apple Application Support is where single copies of program files used by multiple different Apple programs are kept.)
Let's try something relatively simple first. Restart the PC. Now head into your Uninstall a program control panel, select "Apple Application Support" and then click "Repair".
If no joy after that, try the more rigorous uninstall/reinstall procedure from the following post:
Re: I recently updated to vista service pack 2 and I updated to itunes

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