Modify win7 boot items after centos7 installation

1. Edit the /boot/grub2/grub.cfg file with
    vi vi /boot/grub2/grub.cfg
   
    to find the following
    paragraph ### BEGIN /etc/grub.d/30_os-prober ###
    ### END /etc /grub.d/30_os-prober ###
    Modify to the following paragraph (+2 without spaces)
    ### BEGIN /etc/grub.d/30_os-prober ###
    menuentry "Windows 7"{
      insmod part_msdos
      insmod ntfs
      set root='(hd0,msdos1)'
      search --no-flooppy --fs-uuid --set 6a9463b094637e07
      chainloader +2
   }
   ### END /etc/grub.d/30_os-prober ###
  
   View the uuid
    blkid of the partition /dev/sda1
  
2. Modify win7 as the default boot system to
    view the default boot kernel
      grub2-editenv list
    Modify the default boot system (the string in double quotes is "Windows 7" in the modified grub.cfg above)
      grub2-set-default "Windows 7"