I had some sonic updater thing on here - I removed it just in case but there was no other sonic stuff. I also removed another couple of burning programs I had and just for good measure I uninstalled/reinstalled MBAM again [as per the directions here] I Went through the regedit article and came to "If you do not see the LowerFilters registry entry, unfortunately this content is unable to help you any more" and I didn't have the LowerFilters. Anyway, I retried to burn an audio disk and got the same failure result. Tried again with MBAM off and also got the same error - well I think that at least clears MBAM if nothing else. Thanks for the suggestions.