I have ifo, bup and vob files for dvd. I have tried to burn these files onto a dvd-r blank disc with nero6.I put files in the videots and audio ts folders as they should be. It has worked once for me but now it keeps saying theres an error with speed. I have tried all three speeds that are avilable in the drop down list but no joy. Can somebody please advise how to get these files onto blank dvd-r.