@Bartle
I would install a Windows boot loader to sda only and see if Windows boots directly. Script shows partition and files are there. Perhaps the FIBMAP: error is preventing the os-prober from finding Windows? You can manually add a Windows boot stanza to 40_custom.
gksudo gedit /etc/grub.d/40_custom
#update grub menu
sudo update-grub
I changed UUID to yours from Boot scrip.
Code:
menuentry "Windows 7 (loader) (on /dev/sda1)" {
insmod ntfs
set root=(hd0,1)
search --no-floppy --fs-uuid --set 64E8BAF3E8BAC31A
chainloader +1
}
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