I was creating DVDs on Movie Factory 4 that worked well,. I upgraded to 5 and each time I tried to burn a disk I giot a message that there was a format mismatch - which continued even after uninstalling 5 and re-installing 4. I have seen others have had this problem. The solution was NOT to tick the MovieFactory option in the create AVI menu and MF then recognised it. Hope this helps others with this problem. Eric123