The only way to move it is to clone the drive, which means moving everything. It is not possible to use a cloning tool on a drive and only move the Windows install. Cloning programs work exclusively at the sector level rather than the file system level (at least, that's what you need to do in order for the clone to really work properly).
You can't deactivate your old copy of Windows either, like you would with a copy of an Adobe product such as Acrobat Pro. When they say in the license agreement that you must remove the old copy of Windows that is using your existing license key, they mean format the old drive.