I am trying to install 32-bit win 7 on a HP Stream c004tu that comes with a Samsung MBG4C eMmc harddrive, with win 8.1. After clicking 'install now' I get "A required CD/DVD drive device driver is missing. If you have a drive floppy disk, cd, dvd or usb flash drive please inset it now." I have tried various things like using Rufus, checking the md5, trying the x64 iso, disable secure boot, enable legacy, changing usb ports and checking the iso. When I do diskpart->list disk, during the installation, it says "there are no fixed disks to show". Someone with a similar problem solved it by loading emmc drivers. Another person suggested using SATA controller drivers. Though I can't find any of these drivers. Please help!