Things you will need: Windows 7/ DVD Download Tool Software, Windows 7/ Windows 8 ISO File, 4 GB USB Drive
Download Windows 7/ DVD Download Tool, and install it
Plugin the USB Drive to your computer.
Open the Windows 7/ DVD Download Tool
Click on browse and locate the Windows 7/ Windows 8 ISO file which you have copied it on your computer hard disk
And click on next, it will ask you to select the media type you will have to select USB device and then select the proper USB drive connected to your computer and click on begin copying, if your USB Drive is not empty than on selecting begin copying a prompt will appear asking you Erase USB Device, select Erase USB Device and it will start formatting your USB Drive.
It will take several minutes to copy files from ISO to USB Drive, and when it’s done you can use the USB Drive for Installing Windows 7/ Windows 8 by booting from the USB Drive.