Measurement Studio 6.0 is a PAID upgrade from Measurement Studio 1.0. You can't download it, you have to order the upgrade. Patches and free upgrades are available on the web for download. What CD do you have? If you DO have a Measurement Studio 6.0 CD, then you need to reinstall. If you only have a Measurement Studio 1.0 CD, you can upgrade at http://www.ni.com/upgrade.
Sorry if this is info you already know,
Chris Matthews
National Instruments