Quicktime corrupted / iTunes won't launch / Win 7

I've been avidly reading the posts of "b noir" to try and remedy my situation but so far to no avail.
Briefly: I "broke" both QuickTime and iTunes by trying to make UbiSoft's Myst run on my Win 7: the solution there was to uninstall QuickTime (10) and install QuickTime (6). I did that and Myst kind of ran... So I went to uninstall QT6 and my major problems started. I reinstalled QT10 but neither QT or iTunes would launch. I could see the iTunes process via the Task Manager briefly for a second or two but then it goes away. I tried uninstalling QT10 and it would not uninstall: I finally used "Revo Uninstall" to do so and then uninstalled iTunes. Then I reinstalled both via a fresh iTunes install and I have the same situation. No amount of rebooting or install/uninstall seems to get me out of this situation.
Following the posts of "b noir" I can say:
1) I have no "codec" installed (not sure what that is, but I haven't installed anything recently.)
2)my Windows\win32 has no QT files in it
Any help would be greatly appreciated.

My mistake... I uploaded iTunes 10 (which I understand has QuickTime bundled into the install). I checked the version of QT and it is 7.69.80.9.
Just to be safe, I downloaded QT installer from the link you provided and was going to re-install QT but again it fails to uninstall. The uninstall dialog box has a progress bar that seems to get to about 98% and then just rolls back to 0% and I get a splash screen saying the uninstall completed (although it didn't.)
So, to answer your question: yes, QT 7.69.80.9 installs and launches but only very briefly. I was watching the processes via the Task Manager and QuickTimePlayer.exe*32 seems to run for about 1-2 seconds then disappears from the list. One other item appears under processes at the same time (and also shortly disappears) named WerFault.exe*32.
Currently I have iTunes 10 uninstalled, and QT 7.69 installed but unusable.
Thanks for looking into this!

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