Instalar Windows 7 y CentOS 7 a la vez

Paso 1: Windows 7 Instalar

Paso 2: Instalar CentOS

Paso 3: Reparar Grub

#grub2-mkconfig -o /boot/grub2/grub.cfg

#nano /boot/grub2/grub.cfg

menuentry "Windows 7" {
   set root='(hd0,1)'
   chainloader +1
}