After downloading the driver, all you need to do is run the installation program. You can download it to a temporary location on your file, and the installation program will take care of putting the files in necessary locations on your PC.
Additionally, LabVIEW Express is both LabVIEW 7.0 and 7.1. LabVIEW Express was initially used with LabVIEW 7.0 because it was the first version of LabVIEW to use Express VIs. LabVIEW 7.1 is an exentension of this.
Regards,
Anuj D.