WinToUSB is the best Windows To Go Maker that allows you to install and run Windows operating system on a USB hard drive or USB flash drive, using an ISO image or CD/DVD drive as the source of installation. Starting from version 2.0, you can clone current Windows OS installation (Windows 7 or later) to a USB drive as a Windows To Go Workspace. WinToUSB also supports creating a bootable WinPE USB drive, it can help you transfer the contents of WinPE to a USB drive and make the drive bootable.

WinToUSB's key features include:
Easy-to-use wizard interface that provides step-by-step instructions for creating a Windows To Go USB drive.
Creation of Windows To Go from an ISO image file or CD/DVD drive.
Clone an existing Windows OS (Windows 7 or later) to a USB Drive as a Windows To Go Workspace.
Use of a Non-Enterprise Edition of Windows 10/8.1/8/7 to create Windows To Go Workspace.
Creation of Windows To Go on Non-Certified Windows To Go USB Drive.
Support for creating VHD-based/VHDX-based Windows To Go Workspace.

Important notes:
Windows 7 is not completely portable. You may have driver problems when booting on different computers, so highly recommend using Windows 10/8.1/8 to create portable Windows.
Windows 7 does not have built-in USB 3.0 support, so Windows 7 will have to be booted from a USB 2.0 port.
The common USB flash drives are very slow. It takes a long time to install and run Windows from a common USB flash drive, highly recommend using a USB hard disk, a Windows To Go Certified Drives or a SanDisk Extreme CZ80 USB 3.0 Flash Drive to create portable Windows.
Windows To Go drives can be booted on different computers, so you can carry it to anywhere and use it on any computer.
You need to be an administrator on the computer you are installing the WinToUSB on.

Version 2.9
Fixed bug: Unable to extract files from the wim file in some cases
Improved VHD(X) disk partitioning and formatting algorithms
Fixed bug: Check update improvements
Update French, Hungarian translation
Fix other minor bugs

Only for V.I.P