Hi,
the easiest way is here:
http://www.intowindows.com/how-to-install-windows-7vista-from-usb-drive-detailed-100-working-guide/
Then delete on USB disk file ei.cfg. This file is located in folder sources.
After this, remove DVD with Windows 7 Ultimate from your computer and boot from USB key - you will be able to choose editon. Product key is located on OEM stick under battery or somewhere on your notebook.
This posting is provided "AS IS" with no warranties or guarantees, and confers no rights.
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