Help! Itunes install error 7 (windows error 127)

trying to install itunes 10.5.1...having lots of trouble!
it seems to install, but whe I go to launch, I got this error message...
"The procedure entry point kCMByteStream notification_Available length changed could not be located on the dynamic link library CoreMedia.dll", then when I close that I get another message saying "itunes wcs not installed correctly. Please reinstall itunes. Error 7 (Windows Error 127).
I have unistalled and reinstalled several times, to no avail..very frustrating! any help would be GREATLY appreciated!!!!
Thanks
simon

"The procedure entry point kCMByteStream notification_Available length changed could not be located on the dynamic link library CoreMedia.dll", then when I close that I get another message saying "itunes wcs not installed correctly. Please reinstall itunes. Error 7 (Windows Error 127).
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 10.2.1 and ever since I did that my itunes won't open any more. Itunes

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Ich kann iTunes nicht installieren. Es erscheint: iTunes was not installed correctly. Please reinstall iTunes . Error7 (Windows error 127)

Ich kann iTunes nicht installieren. Es erscheint: iTunes was not installed correctly. Please reinstall iTunes . Error7 (Windows error 127)

Google translate:
I can not install iTunes. There appears: iTunes what not installed Correctly. Please reinstall iTunes. Error7 (Windows error 127)
First try:
Issues installing iTunes or QuickTime for Windows
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If still problem post in the iTunes for Windows forum. This is the iPod touch forum

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I have an article for you that can help you go through that process of uninstalling and reinstalling iTunes. If you have Windows 7, you will want to see this article:
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
http://support.apple.com/kb/ht1923
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http://support.apple.com/kb/ht1925
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iTunes Store purchases or songs imported from CDs are saved in your My Music folder by default and are not deleted by removing iTunes. While it is highly unlikely that you will lose any contents of your iTunes Library when following these steps, it is always a good idea to ensure that your iTunes library is backed up. If you're unsure how to backup, see iTunes: Back up your iTunes library by copying to an external hard drive.
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