Refresh Windows 8.1 With USB Installer

I have the Windows 8.1 installer ISO contents on a USB flash drive, and I would like to use it to refresh my Windows 8.1 installation which has become corrupted. How can I do this? Whenever I go to the advanced boot option, all it does it prompt with a message asking me to insert either my install CD or recovery media.

Answer

Use Rufus for making any iso bootable,it is very simple to make iso bootable from this tool,its very lightweight tool!