Maybe nobody wants to hear this. Microsoft has left behind the old 'standard' for the MBR thing. Because it was not a real useful standard. Vista expects you to
leave the boot sector information alone. Third party programs that try to do things with the MBR can really mess things up. Before using any of the old favorite disk utilities on Vista, make sue of two or three things.
1. Make a real backup of the Vista system mad your data on separate media.
2. Know what you are doing.
3. Ask somebody else anyway.
( Try for at least two our of the three.)