http://www.microsoftstore.com/store/msusa/html/pbPage.Help_Win7_usbdvd_dwnTool
When you choose to download most software from the Microsoft Store, you have the option of using Download Manager or downloading from your browser. However, when you purchase Microsoft Windows 7 from Microsoft Store, you have an additional choice to make: whether to download a collection of compressed files or to download an ISO file. An ISO file combines all the Windows 7 installation files into a single uncompressed file.
These instructions are for Windows 7 only. If you're looking for instructions about downloading Windows 8, click here.
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To install the Windows 7 USB/DVD Download tool:
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Click to open the Windows 7 USB/DVD Download tool installation file.
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When you are prompted to either save the file to disk or run it, choose Run.
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Follow the steps in the setup dialogs. You'll have the option to specify where to install the Windows 7 USB/DVD Download Tool.
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