With option 1 and 2 it always complained that the media is not as expected. Only the third option worked without a warning. BUT the result on all three is always the same: The server reboots, the Windows installer is starting but the virtual drive is not available. I also tried downloading the driver ( for the S140) manually from the Dell homepage and copied it to a USB stick, but Windows cant find any drivers (when manual browsing for it). The result is the same with BIOS or UEFI