Create Bootable USB Drive:
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Start PowerISO (v4.8 or newer version, download here).
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Insert the USB drive you intend to boot from.
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Choose the menu “Tools > Create Bootable USB Drive”. The “Create Bootable USB Drive” dialog will popup. If you are using Windows Vista or Windows 7 / 8 operating system, you need confirm the UAC dialog to continue.
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In “Create Bootable USB Drive” dialog, click “…” button to open the iso file of Windows 7 or Windows 8.
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Select the correct USB drive from the “Destination USB Drive” list if multiple USB drives are connected to the computer.
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Choose the proper writing method. “USB-HDD” is recommended.
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Click “Start” button to start creating windows 7 / 8 bootable USB drive.
If no errors occurred in the above process, you should now be all set to setup Windows 7 / 8 from USB drive!