google how to make a "windows to go" USB thumb drive image
http://tweaks.com/windows/52279/how-to-create-a-windows-to-go-usb-drive/
I create one and it worked pretty well on usb 3.0, kind of slow on usb 2.0.
also, you are going to want to get a fast USB thumb drive. (windows to go certified thumb drive's cost a lot)