Want to install Windows 7 from a USB flash drive?

Installation

To install the Windows 7 USB/DVD Download tool:

1. Click here to download the Windows 7 USB/DVD Download tool installation file.
2. When you are prompted to either save the file to disk or run it, choose Run.
3. Follow the steps in the setup dialogs. You'll have the option to specify where to install the Windows 7 USB/DVD Download tool and whether to create shortcuts on your Start Menu or Windows Desktop.

You need to be an administrator on the computer you are installing the Windows 7 USB/DVD Download tool on. The tool requires the Microsoft .NET Framework version 2.0 or higher. If this is not already installed on your computer, the installation program will install it for you. In this case, you may have to reboot your machine to complete installation.

System Requirements

• 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

Source and additional info: http://store.microsoft.com/Help/ISO-Tool