Windows 8 partition does not boot

I am unable to boot my Windows 8 partition, I have tried using boot repair several times. I no longer see the EFI folder in my Windows partition.

I have tried editing the 40_custom file:

menuentry "Windows 8 Recovery" {
   set root='(hd0,gpt2)'`

   chainloader /EFI/Boot/bootx64.efi
}

}

menuentry "Windows 8" {
   set root='(hd0,gpt4)'`
   chainloader /EFI/microsoft/BOOT/bootmgfw.efi
}


menuentry "Microsoft Windows Vista/7/8 x86_64 UEFI-GPT" {
  insmod part_gpt
  insmod fat
  insmod search_fs_uuid
  insmod chain
  search --fs-uuid --set=root --hint-bios=hd0,gpt4 --hint-efi=hd0,gpt4 --hint-baremetal=ahci0,gpt1 1ce5-7f28
  chainloader /efi/Microsoft/Boot/bootmgfw.efi
}

This is the list of the partitions: http://paste.ubuntu.com/5984434/.

Windows Recovery Environment (loader) (on /dev/sda2):

    error: can't find command drivemap.
    error: invalid EFI file path

Windows 8 (loader) (on /dev/sda4):

    error: can't find command drivemap.
    error: invalid EFI file path

Both Ubuntu and Windows were installed in UEFI mode.If anyone has any ideas on how I can access my windows partition, thanks in advance.