Windows Vista User upgraded to iTunes 7.7 and now MPEG-4 videos won't play

I'm a windows vista user, and I just updated to iTunes 7.7 with Quicktime.
Prior to the update all my videos & related codecs files worked just fine(e.g., MPEG-4 and H.264 codecs).
However, since the Quicktime & iTunes 7.7 update, now only videos coded as H.264 will play correctly and MPEG-4 video files only have sound but no video picture.
Any suggested on how to fix this issue is greatly appreciated.
Windows Vista

This issue has since been resolved

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Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Step 1
For this step, the title of the Console window should be All Messages. If it isn't, select
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from the log list on the left. If you don't see that list, select
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In the top right corner of the Console window, there's a search box labeled Filter. Initially the words "String Matching" are shown in that box. Enter the name of the crashed application or process. For example, if iTunes crashed, you would enter "iTunes" (without the quotes.)
Each message in the log begins with the date and time when it was entered. Select the messages from the time of the last crash, if any. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
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In the Console window, select
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warren.b.paul wrote:
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tt2

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