QuickTime 7.55.90.70 will not launch properly

iTunes 8.0.1.11 / QuickTime 7.55.90.70
Dell Dimension 4600, Intel Pentium 4 at 2.8 GHz w/1MB cache, 1024MB DDR SDRAM at 333MHz, Integrated Intel Extreme Graphics 2
Windows XP Home Edition Version 5.1, Service Pack 3
I've been successfully running iTunes and QuickTime on this system for over a year. I often use QuickTime to watch iTunes Store-purchased videos when I'm offline.
The problem started yesterday evening.
When I launch QuickTime, the window flashes open for a split-second and closes. The program button still appears in the toolbar; however, everything but Move, Mininize and Close are greyed out.
I tried the following fixes. All have failed.
1. Ran Windows System Restore to point before problem occurred.
2. Ran Repair QuickTime from Start Menu / Programs.
3. Uninstalled QuickTime from Start Menu / Programs.
4. Downloaded QuickTime from Apple website and installed. QuickTime would still not run and iTunes stopped working, with error message that QuickTime was missing.
5. Uninstalled iTunes and QuickTime from Control Panel.
6. Downloaded QuickTime + iTunes from Apple website and reinstalled.
7. Deleted all QuickTime preferences files (I found four).
8. Re-entered registration number for QuickTime. (I upgraded to QuickTime Pro earlier this year.)
iTunes is now working normally but QuickTime still will not launch properly.
It's possible that yesterday I launched iTunes while QuickTime was running; it's the only thing I can think of that might have created this problem.
Thanks in advance for your help.
Message was edited by: pipermaru
Message was edited by: pipermaru
Message was edited by: pipermaru

It sounds as if you have more of a problem than I did. I'm not an expert and I'm hesitant to make suggestions that might make the problem worse.
In the meantime, I do recommend that you back up all of your iTunes music before you do anything else, and get into the habit of backing up on a regular basis.
Then you might want to try this: completely uninstall both iTunes and QuickTime (using Revo, unless you know how to clean up the registry on your own). Then reinstall both programs (available at the link I posted earlier) and see if that takes care of the problem.
If this doesn't work, I suggest you start your own thread describing the problem and asking for help. Hopefully an Apple rep -- or at least someone more experienced than I am -- can help you.
Sorry I can't be more useful, and good luck.

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