No audio from mpg1 muxed videos

After upgrading to 7.1.6, all of a sudden I can't hear the mpg 1 muxed audio from within Quicktime Pro. I know I can't edit, etc. until I have converted, but I just plain can't hear the audio when played in Quicktime. I played the same video on another computer with the upgrade and it works fine. Any ideas?
Thanks.

Thanks for the reply. My Audio Midi Setup Output is grayed out with a message that Output is not supported. Since I use Soundtrack pro and Peak for my audio editing, etc. I uninstalled Garage Band.
Also, every previous mpg1 that I know played with audio, does not now play the audio, only video. It's not only one. I gave one of the files to a colleague and it plays just fine on his exact same laptop. Other than he doesn't use Quicktime Pro. ????
All of a sudden something is keeping Quicktime from playing the audio on all muxed mpg1 files.
Thanks again for ANY help.

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Complete name                            : 01.avi
Format                                   : AVI
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ID                                       : 1
Format                                   : MPEG Audio
Format version                           : Version 1
Format profile                           : Layer 3
Mode                                     : Joint stereo
Mode extension                           : MS Stereo
Codec ID                                 : 55
Codec ID/Hint                            : MP3
Duration                                 : 20mn 27s
Bit rate mode                            : Constant
Bit rate                                 : 112 Kbps
Channel(s)                               : 2 channels
Sampling rate                            : 44.1 KHz
Compression mode                         : Lossy
Delay relative to video                  : 22ms
Stream size                              : 16.4 MiB (10%)
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Interleave, duration                     : 40 ms (1.00 video frame)
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Complete name                            : new_01.avi
Format                                   : AVI
Format/Info                              : Audio Video Interleave
File size                                : 557 MiB
Duration                                 : 24mn 7s
Overall bit rate                         : 3 228 Kbps
Writing library                          : VirtualDub build 32842/release
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ID                                       : 0
Format                                   : MPEG-4 Visual
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Format settings, QPel                    : No
Format settings, GMC                     : No warppoints
Format settings, Matrix                  : Default (H.263)
Muxing mode                              : Packed bitstream
Codec ID                                 : XVID
Codec ID/Hint                            : XviD
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ID                                       : 1
Format                                   : PCM
Format settings, Endianness              : Little
Format settings, Sign                    : Signed
Codec ID                                 : 1
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Bit rate mode                            : Constant
Bit rate                                 : 1 411.2 Kbps
Channel(s)                               : 2 channels
Sampling rate                            : 44.1 KHz
Bit depth                                : 16 bits
Stream size                              : 244 MiB (44%)
Alignment                                : Aligned on interleaves
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Thanks SteveG,
Ok, What about add the same audio from 25 fps video to 29.97 fps video with settings below:
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Complete name                            : 01.wmv
Format                                   : Windows Media
File size                                : 259 MiB
Duration                                 : 24mn 8s
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Bit depth                                : 8 bits
Scan type                                : Progressive
Compression mode                         : Lossy
Bits/(Pixel*Frame)                       : 0.141
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ID                                       : 1
Format                                   : WMA
Format version                           : Version 2
Codec ID                                 : 161
Codec ID/Info                            : Windows Media Audio
Description of the codec                 : Windows Media Audio 9.1 - 192 kbps, 48 kHz, stereo 1-pass CBR
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Bit rate mode                            : Constant
Bit rate                                 : 192 Kbps
Channel(s)                               : 2 channels
Sampling rate                            : 48.0 KHz
Bit depth                                : 16 bits
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