It is not clear from your post, but are you in a situatin where you cannot boot Windows 7 or Vista? If that is the case, then I think the boot manager was on the Vista partition?? Bu, in any case, If you are able to boot up, I would suggest you give the partitions names for recognition. As Reghakr warns, the situation changes when you boot into safe mode. If you have lost your boot manager, which I may have misunderstood from you post, the easiest course is to boot up with the windows 7 DVD and select "repair startup"