> Windows setup ISOs
You can't dd them. Format a USB drive, make a fat32 or ntfs[1] partition. Extract all the files from the ISO (mount -o loop to an intermediate directory and copy the files out, 7z can also do it) onto said partition. Set the bootable and ESP (EFI System Partition flag) flags. Works like a charm every time.
(You can also try the woeusb[2] tool, but it's not doing anything fundamentally different to or better than that.)
1. Fat may be problematic; iirc install.wim is >4gb lately. But ntfs-3g is adequate if lacklustre.