1) Make sure your USB drive is formatted to FAT32 with one partition only and has no shadow 'hidden' partitions.
2) Make sure your BIOS is set to UEFI
- Check for BIOS mode: Win button > Type 'system information' > look for 'BIOS mode'.
- Not UEFI? Enter your BIOS settings and switch it to UEFI only (no legacy or UEFI+legacy).
3) Insert the USB stick before starting your computer and try injecting.
4) Some USB drives are not bootable like Sandisk, test with another USB stick.