How to create a Windows 8/8.1 bootable USB Flash drive

1.   Download the Windows 7 USB/DVD Download Tool 

2.   To install the downloaded tool you need .Net Framework 2.0. Follow this link to enable the .Net Framework in online/offline mode

3.   Continue with installation of the tool after enabling the .Net Framework 2.0

4.   Now insert your Flash Drive/Pen Drive in to your system and format it with ntfs format.

5.   Now open the Windows 7 USB/DVD Download Tool.

6.   Click the Browse button of the Source file and select the image file(.iso) of Windows 8/8.1. Click Next.

7.   Choose the Media Type option USB Device (or, DVD in case if you want to write a DVD).

8.   Select your USB device(if device not displayed press the refresh button) and Click Begin copying. 

Your device is ready to use as a bootable Flash drive after successful completion.