Video freezes during playback--audio is fine

I recently recorded a 3 minute broadcast using VC3 on a new Dell (Vista) laptop. I was able to review the broadcast and everything seemed fine. After publishing, however, the final video now freezes at 25 seconds. The audio continues to play, but the video does not. I opened the VC project and the same thing now happens there (freezes at 25 seconds). There are no transitions or changes at the 25 second mark in the project, so I'm not sure why it happened. I've tried to publish again as a different file type, but nothing changed. I have done a few other projects that were the same length or longer on this same computer and have not had any issues. I'm looking for a way to fix this problem without redoing the project. Is there a way to? Or is there a way to get the raw video feed from wherever it is on the computer and drop it into another project?
Thanks!

Thanks Randy,
Yes, I have captured in DV, down-convert from HDV. The image, for the most part, plays on the external monitor, but occasionally freezes...while it continues to play on the computer monitor. this problem is getting worse over time. I've been trough all the usual suspects from overlapping windows & timelines through trashing FCP preferences and repairing permissions on the hard drive. I've even reinstalled my OSX Tiger and Final Cut (twice actually as at one point I lost my boot drive & had to replace it) I have two different decks, and it doesn't matter which deck the firewire goes to, the monitor freeze happens with either one. ( I have no problems capturing, by the way) Since this is the second HDV project I have had on this equipment and did not have this problem on the other project, I am beginning to wonder if this might be a hardware problem.
Any ideas??

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