Why to install windows 8.1 from DVD if there are methods presents for installing it from USB. Yeah ! one can easily install windows 8.1 directly from usb by using microsoft official tool.
1. Download the Windows 7 USB/DVD Download Tool and thereby run it.
2. In the SOURCE file , browse and select your correct path where windows 8.1 image file is located.
3.Select USB Device to make bootable usb or DVD disk for bootable dvd disk.
4. Select USB device from the drop down list and select BEGIN COPYING.
Now reboot your computer , press the appropriate key for boot menu selection , then select USB and start installing windows 8.1