Download the utility from Microsoft:
http://images2.store...SB-DVD-tool.exe
http://store.microso...m/Help/ISO-Tool
Using the Windows 7 USB/DVD Download Tool
To make a copy of your Windows 7 ISO file:
1. Click the Windows Start button, and click Windows 7 USB/DVD Download Tool in the All Programs list to open the Windows 7 USB/DVD Download Tool.
2. In the Source File box, type the name and path of your Windows 7 ISO file, or click Browse and select the file from the Open dialog box. Click Next.
3. Select USB Device to create a copy on a USB flash drive or select DVD disk, to create a copy on a DVD disk.
4. If you are copying the file to a USB flash drive, select your USB device in the dropdown list and click Begin copying. If you are copying the file up to a DVD, click Begin burning.
For more details, please read:
http://store.microso...m/Help/ISO-Tool
Note:all credits to Microsoft for the content in this post.