Quicktime has broken iTunes - HELP!

Earlier today I opened iTunes and was about to buys some videos for my iPod. There was a notice at the top of the itunes store screen that said I needed to update Quicktime & iTunes in order to play & buy the videos. I clicked and followed the on screen instructions and then when I tried to open itunes I got a notifcation saying:
"The iTunes application could not be opened. A required iTunes component is not installed. Please repair or reinstall Quicktime. (-42404)"
What do i do?
I've tried repairing Quicktime and iTunes and Apple doesnt have a support email which by the way is absolutely STUPID.

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I recommend following the steps in the article below when getting an error message trying to install iTunes:
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http://support.apple.com/kb/HT1926
Thank you for using Apple Support Communities.
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"iTunes + Quicktime" has an invalid signature. It will not be installed.

What am I supposed to do???
I have tried and tried for weeks now.
1. a box pops up that says "Apple Software Update" and it says "New software is available from apple"
2. I click on "Install 1 Item"
3. I click on "accept"
4. It acts like its downloading...
5. "iTunes + Quicktime" has an invalid signature. It will not be installed.
and after i click okay it says if problem presists then click on tools>Download only...
i did that and it STILL SAYS THE SAME THING!!
HELP!?!?!?

I don't understand it ... but it works..
1. Get a POP-Up that says I need to update my Quicktime and iTunes players.
2. I click ok -- DO IT!!
3. I get the error -- "quicktime has an invalid signature".
3a. I google the phrase
4. I come here are read these pages ...
5. I go to microsoft,com and do not find SP3 for XP .. and think that the comments here are "right on" that is not the first choice .. gettting something "new" from Mr. Gates and his crew.
6. I go to apple.com ...download the files
7...... and all is well??!!!!
8.... wondering ...where does that pop-up come from that asks me to update ..?? if not from apple??!!
Oh Well ... Very happy now ... thank you all for taking the time to input...and educate this old man.
Respectfully,
CP

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