Follow Below Steps:
- Plug in your Pen Drive into USB Flash Port.
- To make a Windows bootdisk (Windows XP/7) select NTFS as file system from the drop down.
- Then click on the buttons that looks like a DVD drive, that one near to the checkbox that says “Create bootable disk using:”
- Choose the XP ISO file.
- Click Start, Done!
Read more: https://softlay.net/operating-system/create-windows-7-bootable-usb-install-disk-drive-iso.html