Audio/video sync macbook

I have a very strange problem. I have made a movie in FCE and exported it as MPEG-4 (1280x720) - audio as AAC 44.100 kHz using Quicktime Conversion.
This all worked fine and it plays correctly on my mac pro running 10.6.4 with the latest QT.
I copied this file (as a zip - over wifi) to my wife's macbook also running 10.6.4.
The copied file in her QT runs with the audio out of sync and about 2 or 3 seconds in front of the video. Why would it play differently on her machine to mine? Very odd. However if I play it on VLC on her machine it plays perfectly.
It is a wedding video that I would like to distribute to the family.
How can I make it so that it plays ok on any machine?
Any ideas?

it's impossible to sync the computer get 100% no indication of the progress of the movie and audio on the tv
the tv itself can keep it in sync
but for the computer or ios device speaker to be able to sync it too the tv would have to feedback sync info all the time to the computer
current systems does not support that
same deal with bluetooth speakers and the likes the computer or ios device can assume that the audio is istant but in the real world there is audio proccessing which take a bit of time

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    Format                                   : MPEG-4
    Format profile                           : QuickTime
    Codec ID                                 : qt 
    File size                                : 144 MiB
    Duration                                 : 24mn 38s
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    Encoded date                             : UTC 2014-01-22 15:04:01
    Tagged date                              : UTC 2014-01-23 19:33:59
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    ©TSC                                     : 2500
    ©TSZ                                     : 100
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    ID                                       : 1
    Format                                   : AVC
    Format/Info                              : Advanced Video Codec
    Format profile                           : [email protected]
    Format settings, CABAC                   : No
    Format settings, ReFrames                : 2 frames
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    Codec ID/Info                            : Advanced Video Coding
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    Bit rate                                 : 683 Kbps
    Width                                    : 854 pixels
    Height                                   : 480 pixels
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    Frame rate                               : 25.000 fps
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    Language                                 : English
    Encoded date                             : UTC 2014-01-22 15:04:00
    Tagged date                              : UTC 2014-01-22 15:04:06
    Color primaries                          : BT.709
    Transfer characteristics                 : BT.709
    Matrix coefficients                      : BT.709
    Audio
    ID                                       : 2
    Format                                   : AAC
    Format/Info                              : Advanced Audio Codec
    Format profile                           : LC
    Codec ID                                 : 40
    Duration                                 : 24mn 38s
    Bit rate mode                            : Constant
    Bit rate                                 : 128 Kbps
    Channel(s)                               : 2 channels
    Channel positions                        : Front: L R
    Sampling rate                            : 48.0 KHz
    Compression mode                         : Lossy
    Stream size                              : 21.7 MiB (15%)
    Language                                 : English
    Encoded date                             : UTC 2014-01-22 15:04:00
    Tagged date                              : UTC 2014-01-22 15:04:06
    Other
    ID                                       : 3
    Type                                     : Time code
    Format                                   : QuickTime TC
    Duration                                 : 24mn 38s
    Time code of first frame                 : 00:00:00:00
    Time code settings                       : Striped
    Language                                 : English
    Encoded date                             : UTC 2014-01-22 15:04:00
    Tagged date                              : UTC 2014-01-22 15:04:06

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