I have tried that MAJ, but I got the error message 'Powerpoint cannot insert a movie from the selected file. Verify the path and file format are correct and then try again' I was trying to insert a video clip from YouTube. Any thoughts??
Having said that, Kernow999, the other computer that you want to use the presentation on might not have the correct codec either. Maybe downloading it as an MPEG rather than an AVI might be a better course of action.