Random selections of mp4 videos won't sync, convert for iPhone option in iTunes comes up with unknown error 2002, help please!

I've been having massive issues copying mp4 video files onto my iPhone 4 from my windows 7 (64 bit) pc.
I converted a large number of avi files into mp4 using aiseesoft movie converter and most of them work just fine.
However about a quarter of the files with no Obvious difference in size and converted the same way will not sync.
Instead a message appears saying these cannot be played on the iPhone.
Also when then trying to use the iTunes convert for iPhone function It fails for unknown error 2002.
Any help on why this is happening and how to stop it would be greatly appreciated.
Thanks

When the videos are in the Movie library, try using the Create IPod and iPhone Version in the Afvanced tab of iTunes.

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