Testing drive /dev/cd0 (cd9660)...

Hi Everyone
I'm trying to fix my mother in-laws Lenovo Flex 2-15 windows 8.1
I've downloaded and created a usb drive, when I start the laptop, it loads and gets to a point where this is on the screen;

Testing drive /dev/cd0 (cd9660)..

g_vfs_done():dc0[READ(offset=32768, length=2048)]error = 6

mount_cd9660: /dev/cd0: Device not configured

ls: /dev/da*: No such file or directory

ls: /dev/ada*: No such file or directory


That's it, it keeps repeating this process and after lots of attempts, it times out . Any ideas?