Screwed up QT removal, now not able to install iTunes

Hey everybody,
Just yesterday I got my new iPod Nano and was totally excited to try it out, so I downloaded iTunes 7, but got a message saying "The older version of QuickTime could not be removed. Contact your technical support group".
Subsequently I closed the installation and tried it again with the same result. I then opened the Control Panel folder and navigated to "Add or Remove Programs" and tried to uninstall QT through that but the Uninstaller closed down itself, still while showing the message "QuickTime setup is preparing the InstallShield Wizard (...)"
Remembering the old words "Google is your friend" I searched for a way to uninstall programs manually and found a nice page explaining it clearly (HERE).
I deleted the directory in the Program Files folder and deleted the QT folder from HKEYLOCALMACHINE\SOFTWARE and HKEYCURRENTUSER\SOFTWARE. I also checked if there were any services attached to it but couldn't find any in KEYLOCALMACHINE\System\CurrentControlSet\Services.
Well, I then tried to install iTunes again and, guess what, I got the same error message.
Any help would be highly appreciated!
Thank you very much in advance!
syspect

i read this thread http://discussions.apple.com/thread.jspa?threadID=639555&tstart=0 and did basically this (copied over from reply 5)
okay, download and install the Windows Installer CleanUp utility and use it to clear any existing QuickTime installation configuration information from your PC. if your existing iTunes still refuses to uninstall via add/remove after that, use CleanUp to remove your existing iTunes installation configuration information.
Description of the Windows Installer CleanUp Utility
then clear away leftover itunes and quicktime program files and folders from the PC. follow these steps:
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 iTunes folder and click Delete from the shortcut menu.
5. Right-click on the QuickTime folder and click Delete from the shortcut menu.
6. Open the iPod folder.
7. Right-click on the bin folder and click Delete from the shortcut menu.
8. Navigate to C:\Windows\system32\.
9. Remove the files QuickTime.qts and QuicktimeVR.qtx.
10. Restart your computer.
Windows XP
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