Itunes application could not open. Required iTunes component not installed

After 3 weeks of frustration, I would greatly appreciate any help anyone may be able to offer.
I have been attempting to sync my new iphone to itunes. Initially, I received the message *"This iphone cannot be used because the required software is not installed"* when itunes started.
I spent a week trying to fix this error, following suggestions to completely remove all apple software and reinstall, login as a different user, and disable startup programs including antivirus/firewalls (see *http://discussions.apple.com/thread.jspa?messageID=6326342*). After a week of frustration, I decided to wait for itunes 8, hoping it may resolve my issue.
I installed itunes 8, and now itunes will not boot, with the message *"The itunes application could not open. A required itunes component is not installed"*. I followed the instructions in this post: *http://discussions.apple.com/thread.jspa?messageID=8056494&#8056494*, without success.
I rang the Apple tech support line, and the tech support person was not able to fix my issue. I was told that they did not know what was wrong, and that I should reinstall Vista, or contact Microsoft. I am very reluctant to do so, as I do not wish to risk losing my otherwise stable system, not to mention hours and hours of installation time.
I have never had the experience of having such a high value product (iphone) not working, and being told it was essentialy 'my problem'. I would greatly appreciate any suggestions. I have not been able to sync my iphone with my PC for 3 weeks now, and I am becoming very frustrated. I feel quite abandoned by Apple. I love my iphone, but there is no question that this experience will make me think twice about an Apple product in future.
Thanks in advance,
Bartek.
Message was edited by: monkeymagic66

Solution: It appears that Quicktime and iTunes versions got out of sync.
1) Uninstall Quicktime.
2) Download and install an older version of Quicktime (7.5.5 to be exact)
FIXED! Hope this helps the next person

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