John listened attentively and determined that Alex's laptop had a faulty hard drive. He decided that the best course of action would be to perform a clean installation of Windows 7. However, Alex didn't have a DVD drive, and John couldn't send him a Windows 7 installation DVD in time.
If you see this but are using a USB, your BIOS prioritized the CD drive. You need to enter the BIOS (Method 2) and ensure the USB is listed strictly above the CD/DVD drive in the boot order. boot from usb windows 7
If the quick menu doesn't work, you must manually change the "Boot Order" in the system BIOS. This tells the computer to look at the USB drive before it looks at the hard drive. John listened attentively and determined that Alex's laptop