If applications fail then you can use the manual approach.
Remove your USB stick from your system.
Open a terminal and list available devices
Insert your usb stick and list devices again. Locate the new device by comparing the outputs and make a note of it - /dev/sdx
Then use fdisk to create a new partition and set the file system type, boot flag, save the change and format the new partition. Replace sdx with the device you made a note of.
sudo fdisk /dev/sdx
While in the fdisk application
- press o to create a new DOS partition table
- press n to create a new partition
- press Enter four (4) times to accept the defaults.
- press t to change the partition type
- press 7 to select NTFS
- press a to toogle the boot flag
- press w to write changes to disk and exit
Format the new partition to NTFS
sudo mkfs.ntfs /dev/sdxY
Next step is to mount your USB stick and your Windows ISO file. Then use a file manager or the terminal to copy all files and folders from your mounted ISO to your mounted USB.
This is going to take a while - depending on your system - it can take hours to complete.
When the copy is complete - do not remove your USB stick. Execute the
sync command to ensure all memory data is flushed to disk.
When the sync command returns to the prompt you can safely remove the stick - or use the eject function of your filemanager.