Boot Multiple Operating Systems

GAG, THE GRAPHICAL BOOT MANAGER may be the ticket if you can't fix your boot manager when installing XP or Linux after Vista or Win7.

I have used VistaBootPro (Now DualBootPro) - previously free. Seems to need payment now??? VistaBoot lets you fix/modify the Windows boot loader. I don't know how GAG works.

EasyBCD is another free option for modifying the Windows boot loader.

If your dual boot does not work here is a great troubleshooting guide.