Windows 7 and Vista use the same bootloader. No point in replacing it. If you cant get into Vista, add a new entry for Vista in W7 using EasyBCD. While you're there, you can also remove Windows 7's entry from the menu, so that Windows Vista is the only option. Like said before, rename the XP entry to something like say "Windows Vista", but make a copy of it first and modify the copy like pointed out in [post=33925]post 8[/post] in order to boot XP directy without requiring use of Vista's bootmenu.