ITunes and Quicktime don't play videos properly! HELP!

While playing mp4 video's, my iTunes and Quicktime won't play mp4 properly! They play the sound, but the picture is al green with wierd writings on it..
I tried:
- re-installing iTunes and Quicktime to both earlier versions
- installing all possible codec's
And when I want to put it on my iPod it crashes everything..
Anyone know whats wrong? Or does anyone have the same problem?

Hello,
You can find additional information and troubleshooting steps from the following article: http://support.apple.com/kb/HT2729
The symptom you mention is addressed in one of the FAQ's on the page.
Have you tried one of the free videos from the iTunes Store? You can find free video and music content on the iTunes Store. The "Free on iTunes" section is generally towards the bottom of the center column of the window.
Charles

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Problem Event Name:          BEX
Application Name:          iTunes.exe
Application Version:          10.3.1.55
Application Timestamp:          4deec351
Fault Module Name:          StackHash_0a9e
Fault Module Version:          0.0.0.0
Fault Module Timestamp:          00000000
Exception Offset:          00000000
Exception Code:          c0000005
Exception Data:          00000008
OS Version:          6.1.7601.2.1.0.768.3
Locale ID:          1033
Any suggestions?
Thanks.
Sergio

Taken as a whole, the symptoms suggest that another application (other than QuickTime itself) has stashed old QuickTime componentry in your system files.
So just in case we'll go looking for older QuickTime componentry in the most common locations for it to be stashed.
First we'll need to change some view settings.
In your Start menu, open Computer.
In your Organise menu, select Folder Options.
In the View tab, make sure that "Show hidden files and folders" is selected, and Hide extensions for known file types is unchecked.
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Now in Computer, open your C:\ drive (or whichever drive you have your operating system installed on).
Open the "Windows" folder.
Open the "SysWOW64" folder.
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When I open the quicktime player(its appearance doesn't look like a player with controls for play, pause, etc.).
Maybe the controls appear when play begins' however, then I try to open any song of video, I always get the same message: "Do you want to allow this website to open a program on your computer(in itunes, I assume).)
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I upgraded my itunes and stopped working. i uninstall everything that said apple in my pc and install them again and i keep getting this error:
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Message was edited by: Alrojo

"quick time Player has encountered a problem and needs to close. We are sorry for the inconvenience".
The broken QuickTime is most probably causing the iTunes problem. (iTunes needs a properly functioning QuickTime in order to work correctly.)
Let's try swapping out your QuickTime again, taking a few additional explicit precautions this time.
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Papi625
Let me ask you this:
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ITunes and Quicktime don't play videos properly! HELP!

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