ITunes won't reinstall on Win 7 64bit system

I've been fighting with this for at least 3 weeks and I still can't find the answer. I went to upgrade my iTunes to the current version. I had iTunes installed and working just find, but I like to keep things updated as much as possible. I guess I should have left it alone.
When I update, I prefer to uninstall the current version and then install the new. I have never had a problem before. When I try to install, I get the following message during the install process:
unknown\components\DA42BC89BF25F5BD0AF18C3B9B1A1EE8\5C13C3F8A3C98AA4E8AF179 2A0A75D33
Verify that you have sufficient access to that key, or contact your support personnel.
I only have one account on my system, so I have total control over everything. I continue with the process and then get the message again. Needless to say, nothing gets installed. I have tried the QuickTime and iTunes combination install and just the QuickTime install with the same results. I have uninstalled everything related to Apple and still the same. I tried the Windows
Install Cleanup program and no luck. I set the permissions for that key, according to another post, and that didn't help. I tried RegSeeker to find all iTunes and Quicktime entries and then delete them, no luck.
At one point, I got an error message at startup (Apple Application Suuport not found.... then install iTunes again). That message is now gone, but I'm not sure which of my attempts corrected that. I was also getting a Quick Time Player error (Please install Apple Application Support) when I tried to start that.
Basically, I've tried everything I can thing of and still no luck getting the new iTunes to install. Any and all suggestions would be greatly appreciated! Thanks.
Mike

Mike,
I don't have much help for you but I can tell you I have been experiencing this issue for the past several months now; with OTHER applications. I have Windows 7 and only have one user account setup as Admin as well. I've installed everything under that account. I first encountered this type of error with Adobe Reader 9 and Microsoft Office 2007. I first noticed it when trying to apply upgrades to both applications...where both upgrade installers kept failing with the same type of error ("Could Not Open Key: UKNOWN\Components\DA42BC89BF25F5BD0AF18C3B9B1A1EE8\somekey\. Verify that you have sufficient access to that key, or contact your support peronnel.)
Today I tried upgraded iTunes and got a failed install message. I uninstalled the old version and tried installing the 64-bit version of iTunes. I then got the same message above.
When I got to the registry editor for the key listed in the error message, it tells me: "7E577B2224C65CF4E801A9E52375DB49 cannot be openened. An error is preventing this key from being opened. Details: Access is denied." I've read other threads indicating the permissions are not set correction on the key i'm trying to open. So when I right click on the key and click PERMISSIONS, I get an error saying i can't view the current permissions but can make changes (ODD). Clicking OK gives me the ability to edit permissions. Before doing any changes it appears that no permissions are set (none visible - assuming I can't see them based on above error). I add ADMIN as having all permissions available and try to click APPLY / OK but the changes are not made.
The only way I've been able to get around this with Microsoft Office and Adobe was to manually remove all registry keys related to the application I'm removing. I've found articles online which walk you through removing the keys for Office 2007 and Adobe Reader 9 but can't find one for iTunes.
Question: Try going to the following key in your registry and seeing if any of the sub-keys below it give you an error message when you click on them. Do any of them give you an error which indicates you don't have permissions to view that key? Each key under the path below on my computer tells me I don't have permissions to view it. I think there may be something fundamentally wrong with Windows 7...or these apps are not installing correctly from the beginning.
Key: HKEYLOCALMACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Co mponents\DA42BC89BF25F5BD0AF18C3B9B1A1EE8
If you have the same problem...I'm wondering if you and I can team up to figure out what may causing this. Perhaps we should push this issue to Microsoft somehow.
Bill

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