How to Make Bootable USB Without Any Software Support

Right Click on Command  Prompt -> Run As Administrator -> Give Administrator Credentials if it is Prompted -> Switch Caps Lock ON -> Type DISKPART and Press Enter
After Entering into DISKPART Follow the Instructions or Commands Shows in  Below Image.

After Exiting from Command Prompt or DISKPART Extract Windows 7 or Windows 8 ISO Using Winrar and copy extracted folder files into pendrive. After completion of the copying files restart the pc or laptop and slect boot option as USB Mass Storage or USB or Pendrive.