Persistent "Could not open key" message

After installing the 64 bit 9.2 version of itunes + quicktime, the programme refused to run. It was uninstalled (at first it refused to uninstall, giving error messages about key permissions in the registry. I used a 3rd party uninstaller)
I change the permissions for the keys every way imaginable. I have now unistalled and re-installed itunes completely about 30 times in the last 3 days, and every time it gives the error message:
Could not open key: UNKNOWN\Components\DA42BC89BF25F5BD0AF18C3B9B1A1EE8\b25099274a207264182f8181add 555d0. Verify that you have sufficient access to that key, or contact your support personnel.
Any ideas?

I also have the exact same problem. Curious is also that the Apple Applications Support program is not loading.. though everything else does - but they don't run... I suspect there are quite a few of us with this problem since its showing up on a number of forums...
Hope apple figures out something..right now I am dead in the water..

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