Ok I just checked build 7100 and the right click resolutions is on the desktop
Not sure if you can update Vista to that but why update? I am gonna install fresh by the Vista upgrade disc trick that is supposed to work with Win 7 too.
Just boot up with the upgrade disc and install it fresh and don't put in the key and do not select to automatically activate windows. Select the correct version of Windows you are installing (home premium, professional or Ultimate) and select custom advanced install not upgrade. After it installs just boot up with the disc again then select to upgrade Windows and this time put in the key.