Sounds like you have a problem with your .AVI codec You need to go to your device manager, I am hoping you have windows. Select multimedia devices and check to see if your video compression codecs are installed. Especially the ones that are called Microsoft video 1 etc. Are you getting the error message right after you specify the file name as click save? If you are the poser is having trouble locating the video compression codec. The procedure for fixing this will require more information.