Iphone 4s videos will not play on Quicktime on my PC, the screen is black but there is sound.  Any ideas?

I am not too computer literate..............
I took some videos of my daughter and went to view them on my computer (pc) and they will not play.  The computer recongnizes them as quicktime files (.MOV) but when they are selected for playback, the screen is black and all that plays is the audio.  I downloaded the latest quicktime pro at $30.00 and the problem still exsists.  The video was taken on an iPhone 4s with the iOS6 updated software. 
What is the problem?  What is the fix?
Thanks

Thanks! Yours works. May I Add?
¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬
Disable Direct3D acceleration in the player you are using.
If you use VLC media player, Go to preferences, Video, And under output, change from default to "Direct 2D video output"
If you use Quicktime, Downgrade to Quicktime 7.6 or upgrade to quicktime 7.7.3 and Go to
Edit --> Preferences -->Quicktime preferences.
Under that, go to advanced tab, and uncheck "Enable Direct3d acceleration" (3'rd box)
Fixed the problem for me
You're welcome
¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬

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    Thanks! Yours works. May I Add?
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