After computer repair, Media & Quicktime no longer play .avi or MP4 files

I'm working on the computer of a friend who has Windows Vista.  A group of computer repair worked on it a few weeks ago because he had some problems which were found to be network settings only no computer problems.  When they give it, Windows Media Player 11 no longer plays MP4 or AVI files.  He will play .mov files but not others.  They used to play fine.  It will play audio, SOMETIMES and ALWAYS shows them as music files.

I tried to reset file associations and all that jazz but no luck.  It has notes of music in folder views, when thumbnail view is selected and when he plays in the media, it shows a double music note and plays again SOMETIMES the audio but not video.

I installed Quicktime for Windows Vista and it will not play them, not even the audio.  Help, please.

I'm very good for Windows up to XP versions through, but am not familiar with Vista or 7.  I know that I'm working on a large number of computers that are both friends and family, and I should get on the same page, but they have SO MANY problems with these 2 versions that I always worked at least 1 or more.  They have never had so much trouble with XP and have made sure I want a new laptop, but I want without operating system so I can install my own choice.

In any case, I need to get the AVI files to work while my friend can see his digital films families.

Thank you

Hello SugarAvenue,

It seems to me that video codecs are corrupted with the computer has been repaired. I suggest that you try to download and install the software that helped create digital movies families and install it to check if it installs missing codecs on the system.

You can check the link that will give you more information about the codecs below:

http://Windows.Microsoft.com/en-us/Windows-Vista/codecs-frequently-asked-questions

Thank you
Irfan H, Engineer Support Microsoft Answers. Visit ourMicrosoft answers feedback Forum and let us know what you think.

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