I tunes error -42404 after installing update

Problem with itunes after update. Windows 7, 64 bit. Have uninstalled, deleted all apple files/folders etc. per other forums (several times with different error msgs). Finally got it to install-had to install Qiicktime separately but am getting following error msg and progrram doesn't work correctly and shuts down.
error msg "A required iTunes component is not installed.Please repair or reinstall iTunes (-42404). Any help would be appreciated.

Hello spiketaz,
iTunes has various components bundled with it that it requires for general usage. I advise that we completely remove iTunes and all of these related components, verify that they have been removed, then reinstall. To do so, please follow the steps in this article:
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
http://support.apple.com/kb/HT1923
Note: it is important to remove the 7 components in order. Uninstalling these components in a different order, or only uninstalling some of these components may have unintended affects.
If the above does not resolve your issue, I recommend we reset the SC Info folder:
iTunes repeatedly prompts to authorize computer to play iTunes Store purchases
http://support.apple.com/kb/TS1389
(See Step 4: Remove the SC Info folder)
Thanks,
Matt M.

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