Install Windows 7 on a Windows 8 Computer With No CD/DVD Drive

Warning: This is a one-way trip; so, you are warned. As you may expect, all data currently on the hard drive will be deleted. We advise you to create a recovery USB stick just in case.  Creating recovery images is painstakingly slow process and may take the whole day. Steps are:

Windows logo {lower left corner of desktop} > Recovery > Create recovery > Insert a USB that is 8 giga-bytes or higher
> Create recovery image

The big battle is for the computer to recognize the USB drive, which will contain the Windows 7 or 8 payload. This means altering the UEFI {Unified Extended/Enhanced Firmware Interface} to legacy-like BIOS settings. Also, you have to do one procedure and restart the computer in order to do the other. If you don’t understand any of this, please find someone with a slight better understanding of how computers work.

Since the system {which means computer} has no optical drive {this is where you would normally place your CD or DVD}, the first thing you have to do is put a bootable Windows 7 image {which means Operating System} onto a USB drive. From any computer, preferably one with 64-bit version of Windows 7 or 8, do the following:

  1. Insert your USB flash drive into the USB port on the PC in question
  2. Format the USB stick as an NTFS volume. Make a note of the drive letter assigned to it {we will use the letter “F”}
  3. Start up a command prompt as an Administrator.
    Windows logo > cmd > runas /user:Administrator cmd > enter password when prompted
    {the Administrator account must be enabled}

Prepare the source image

  1. Change drives or point to the Windows 7 image and run the following:
    {you may mount the ISO using a PowerISO or extract the entire image to some folder/directory and point to that folder}

>cd E:  {if “E” is your where the image is mounted or cd somefolder} then type the following

> cd boot

>bootsect /nt60 F:

  1. After you’ve don the above, in Windows Explorer, copy the entire contents of the Windows 7 DVD to root directory of the USB stick.
  2. While you’re at it, you’ll probably want to grab the LAN or wireless driver from the ASUS support site and copy it onto the stick as well {don’t worry about mixing software with operating system content because it won’t interfere}. Keep in mind that Windows 7 & Windows 8 drivers are generally interchangeable but there may be issues, particularly because Windows 8 is a ‘touch-screen’ operating system.

If you have followed the above, the USB stick is now prepared. Don’t insert the USB stick yet. You now have to start monkeying with the UEFI configuration of the computer. The following steps may be out of sequence, depending on your needs and ability:

  1. Shut down the system if it’s running. If you reboot as normal, it will skip the POST and you won’t be able to boot into the UEFI interface. So we will interrupt the boot up process.
  2. Power on the system. While it’s booting, press F9 to enter the UEFI interface {may be F12 or some other function key, depending on the manufacturer of your computer}.
  3. Select Troubleshoot > then Advanced > elect UEFI Configuration.
  4. In the UEFI configuration, go to the Security page and set Secure Boot Control to Disabled > then Reboot.
  5. Go back into the UEFI interface as previously, then into the UEFI configuration. On the Boot page, change Launch CSM to Enabled.
  6. Insert the USB stick and reboot.
  7. Once again, go back into the UEFI interface just to check everything is correct. On the Boot page, you should now see the USB stick. Go to the Save & Exit page > Restart
  8. Select the USB stick from the list of one time boot options and you should find yourself booting into the Windows 7 installer.
  9. Since Windows 7 doesn’t support GPT, you’ll have to nuke all the partitions to proceed with the install. Yes, this means delete all the listed partitions, which includes the recovery and OEM partitions.> Click on Drive Options (advanced) > select each partition on the disk {normally Disk 0} and hit the Delete button.
  10. Proceed with the Custom installation of the operating system

Click on links below for attachment with these instructions:

Install Windows 7 on Asus S400C (No Optical-DVD Drive)

Install Windows 7 on Asus S400C (No Optical-DVD Drive)

We implemented these steps successfully but all original research & work belongs to its posters.