WinUSB install error Installation failed! Exit code: 512

I am unable to solve this problem, I'm using Ubuntu 14.04. I already tried as root, and I still have not had success.

WinUSB reports this error:

Installation failed!Exit code: 512Log:Formatting device...Mounting...mount: block device /home/flavio/Área de Trabalho/windows xp sp3 sata.iso is write-protected, mounting read-onlyCopying...Installing grub...Installing for x86_64-efi platform.grub-install: error: /media/winusb_target_1405019929_19723 doesn't look like an EFI partition..Error occurred!Syncing.../usr/bin/winusb: line 78:  5376 Terminated               while true; do    sleep 0.05; echo 'pulse';doneCleaning.../usr/bin/winusb: line 78:  6975 Terminated               while true; do    sleep 0.05; echo 'pulse';doneUmounting and removing '/media/winusb_iso_1405019929_19723'...Umounting and removing '/media/winusb_target_1405019929_19723'...