Was eleganter ist:
1) Grub installieren (was das ist, von wikipedia
GNU GRUB ("GRUB" for short) is a boot loader package from the GNU Project. GRUB is the reference implementation of the Multiboot Specification, which allows a user to have several different operating systems on their computer at once, and to choose which one to run when the computer starts. GRUB can be used to select from different kernel images available on a particular operating system's partitions, as well as to pass boot-time parameters to such kernels.
2) Cboot.ini so verändern, dass Vista wieder bootet... wie das geht, weiss ich aber nicht