I tried uploading some videos from my camera to Live Movie Maker.  When the videos loaded in Movie Maker, some them get displayed with a yellow triangle with and exclamation mark instead of a thumbnail.  I click on those icons and I get a message saying the file may be corrupted or in a format that is not supported by Movie Maker.  What confused me about that message is that I check the original videos in the folder they are stored in at they work just fine.  Also, the videos that do work in Movie Maker are in the same format as the ones that don't.  Format is MTS, by the way.  Error number is 0x87260103.  It is also important to note that the first time these videos were uploaded into Movie Maker they all worked at first.  Now some of them don't for some reason.

I tried removing the "corrupted" videos from Movie Maker and re-uploaded them.  They still did not work so what should I do here?