Lightroom 4 video black thumbnails and playback

On loading I see thumbnails for avi videos for about a second and then they go black. On playing in Lightroom the screen is black but the sound is fine. The videos play correctly in Quicktime and other programs.
Any suggestions on how to fix this?
LR4 Windows 7, Core i7, ATI Mobile Radeon HD5850, 8Gb RAM

I used a video conversion program to convert to a different codec. It probably does not need a full codec pack installed, just the coded changed. Google 'codec changer software'. I have not tried any of the free ones so make sure that you make a copy of any file before converting it if the program overwrites the original file.
http://download.cnet.com/windows/video-converters/?tag=bc has some programs

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