Fixed - Windows 7 Installation A required CD/DVD device driver is missing, usb installation

Fixed - A required CD/DVD device driver is missing. If you have a driver floppy disk, CD, DVD, or USB flash drive, please inset it now. 

Windows 7 Installation 

I was getting below error when trying to install windows 7 from USB drive- I checked all the things i.e changed USB, USB ports, bios setup, windows setup on USB but nothing worked- 

A required CD/DVD device driver is missing. If you have a driver floppy disk, CD, DVD, or USB flash drive..

Finally i did below which worked for me, i am sharing this which may help you....

1. Click Cancel on the above message box - you will get below message - click OK..

2. See below - Click "Yes" and then close this box...

3. See below- You will come back on  "welcome screen"

4. Now on welcome screen, remove your USB drive from your PC and insert back to other USB port. Now click Install again

Hope this will work for you and your installation will be normal. This worked for me....Try it