another thought, and experience. Decided other day to clear out all the trial dvd rip/burn solutions I have tried over time.....well that pcouffin driver apparently very popular! After doing the uninstalls/defrag, ect. - I rebooted and decided to rip/burn with my favorite dvdfab. No go, got the dreaded "failed to intialize burn engine" message, and burner did not show up in the app...but was present in windows. Figuring one of the uninstalls wiped it, reinstalled Fab - and everything was fine...... Never did see during those uninstalls "maybe shared by other programs, do you want to keep?" standard windows message.....