Problems installing iTunes on Windows Vista

Question

I have searched these and other forums.  I have uninstalled and reinstalled iTunes NUMEROUS times.  I have cleaned the registry, tried Windows Fix-it, tried to repair Apple Application Software.  I have updated the Microsoft.Net Framwork.  I continue to get the same error.  The software says that it has loaded successfully, but when I try to open the software, I get the following message:
"The procedure entry point AVCFURLAssetInheritURIQueryComponentFromReferencingURIKey could not be located in dynamic link library AVFoundationCF.dll"
My only choice then is to click ok.  When I do that, I get a second error message:
"iTunes was not installed correctly. Please reinstall iTunes    Error7 (Windows error #127).
Can someone please help me with the correct fix for these errors or some other ideas of how to get iTunes correctly installed on my computer.  I have spent HOURS in the last week researching and re-installing and am at my wits end!

Answer 1

For general advice see Troubleshooting issues with iTunes for Windows updates.
The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach. Review the other boxes and the list of support documents further down page in case one of them applies.
Your library should be unaffected by these steps but there is backup and recovery advice elsewhere in the user tip.
The error report suggests a similar problem to those outlined in the fist and third boxes and is probably the result of an outdated .dll file.
tt2