When i installed ratdvd I noticed none of the codecs were registered with the system and they do not display when looking at installed codecs. The file tries to open and the screen is blank. no audio either. All ther movie formats work (which confuses the crap out of me). I install ratdvd again under safe mode to see if that would help. It didnt. I have been trying to setup zoom player to try it with that and again the regg'd codecs do not show up as an option. Has anyone else had this problem? is there any one out there using vista ultimate and ratdvd successfully? any help is appreciated.