Movie Maker Timeline error

When importing a video from my sony camcorder into Vista Movie Maker I
have a problem. The video-file plays fine as it is in other programs but
when dragging to the timeline the length is extended hugely. For example
a 2 min clip shows as 8 hours.
When importing a clip that is longer than 5 min I get an error message
that the clip is longer than 24 hours and then I cant edit it.
Anyone who might come up with a sollution?

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