Video not playing in PowerPoint 2010

I have a PowerPoint presentation that was created in version 2010 and plays an embedded video on most computers.  However, I have one laptop (PowerPoint 2010) that plays the audio but not the video.  I have narrowed down what I think the possible reason may be based on this behavior:  If I select the slide with the video, click to select the video, then try the Trim Video function, the message that displays is "cannot trim media. Ensure that the codec for this media format is installed on your computer."  (Other computers where the video plays this function works as expected.) I performed the Optimize Media Compatibility function in PowerPoint, and it says it is updated, but still the video will not play.  The video that was inserted is in .mp4 format, and the file extension is associated with Windows Media Player.  The laptop is a Samsung with Cyberlink Media Suite that was factory installed...not sure if that has anything to do with the problem but it is one of the unique things I see about this laptop (Windows 7 Professional)

Any ideas?
lita-pieAsked:
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JSRWilsonCommented:
Does this laptop have Quicktime installed. Do the others have either QT or run in Windows 8?
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lita-pieAuthor Commented:
Yes, laptop has Quicktime. Presentation was last modified on a Windows 8 computer running Office 2010; it does play on other Windows 7 computers, however (with Quicktime installed)
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lita-pieAuthor Commented:
Ah...I just tried it on a Windows 7 laptop without Quicktime and it does not play either audio or video; the progress bar at bottom of screen says Quicktime not available.  So maybe something I need to tweak in Quicktime?
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lita-pieAuthor Commented:
and the Windows 8 computer that created it does have Quicktime installed
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JSRWilsonCommented:
Could it be a 64 bit version of Office?

There's a very useful chart on video in PPt on Troy Chollar's blog.

http://www.thepowerpointblog.com/will-powerpoint-play-this-video/

Bottom line Windows 8 can play mp4 natively. Windows 7 needs QT (only 32 bit office AFAIK)
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lita-pieAuthor Commented:
It is 32-bit Office, but 64-bit OS.  The chart you mentioned shows that this should be OK and should play.  I will try reinstalling Quicktime on the laptop and see if that solves the problem.
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lita-pieAuthor Commented:
Reinstalling Quicktime fixed it. Thanks!
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lita-pieAuthor Commented:
His questions steered me to look at reinstalling Quicktime. All points should go to him.
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