Quicktime not installed during update of itunes

Hi,
I have a problem with updating my itunes. It breaks the installation and sais: unable to deinstall an older version of quicktime. Installation not complete.
Did anybody solved such kind of problem?
I already tried to install and deinstall manually quicktime but without success...
samsung   Windows XP  

let's try the following procedure.
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.
does an itunes install go through properly now?

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