Create Windows 7 Bootable Media using Windows 7 USB/DVD Download Tool
With the launch of Windows 7, Microsoft has released a small utility Windows 7 USB/DVD Download Tool, which allows you to create a bootable DVD or USB flash drive of Windows 7 ISO file. When you purchase Windows 7 from Microsoft Store, you have the option to download an ISO file or compressed files.
To create a bootable DVD or USB flash drive, download the ISO file and then run the Windows 7 USB/DVD Download tool. Once this is done, you can install Windows 7 directly from the USB flash drive or DVD.
System Requirements for Windows 7 USB/DVD Download Tool:
Windows XP SP2, Windows Vista, or Windows 7 (32-bit or 64-bit)
Pentium 233-megahertz (MHz) processor or faster (300 MHz is recommended)
50MB of free space on your hard drive
DVD-R drive or 4GB removable USB flash drive
Microsoft .NET Framework version 2.0 or higher