If you are installing CentOS or Red Hat Enterprise Linux on a machine without a DVD or CD drive, then your best option is to create a bootable USB drive. The Red Hat manual provides instructions for Linux, and it is simple to translate these instructions for Windows:

• Download dd for Windows, as well as diskboot.img from your OS distribution media.
• Write the disk image to your USB drive using the command dd if=diskboot.img of=\\.\x: --progress, where x is the Windows drive letter of your USB drive. The --progress flag is optional and lets you see that the records are actually copying to the USB drive.

That’s it!