Not able do install iTunes Ver 7.0 (beacause of QuickTime)

Hello everybody, iTunes was working properly until I installed the version 7.0. Just before the end of the installation I've this message : impossible to open the key HKEYLOCALMACHINE\Software\Classes\QuickTimePlayerLib.QuickTimePlayerApp\CLSID.
Verify that you have the rights for this key or contact technical support.
So it seems the problem is coming from QuickTime. I don't know what to do, I already desinstall Quicktime and Itunes and try to reinstall it but it still doesn't work.
Please Help me I really don't know what else I can do
Thank in advance

okay. the missing/badly-installed QuickTime will be causing the itunes trouble.
let's try this first.
Download and install the Windows Installer CleanUp utility. then use it to clear any existing QuickTime installation configuration information from your PC:
Description of the Windows Installer CleanUp Utility
Next, we’ll manually remove leftover program files and folders.
1. On the Start menu, click My Computer (or double-click My Computer on the Desktop).
2. In My Computer, open Local Disk.
3. Open Program Files.
4. Right-click on the QuickTime folder and click Delete from the shortcut menu.
5. Navigate to C:\Windows\system32\.
6. Remove the files QuickTime.qts and QuicktimeVR.qtx.
7. Restart your computer.
now we'll try slipping in a new QuickTime by doing a repair install of itunes.
go to Add/Remove programs. select itunes, click "Change" and then click "Repair".
does that go through okay? if so, does your itunes launch properly again?

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