I had issues on my old pc (Core2 Duo, Win7 32bit) when I tried to install over: some menu voices simply disappeared or changed name. One of these is the Display Mode that changed in something that didn’t allow me to recognize the correct voice. In the first cases I solved making a deep uninstall of the older version with Revo Uninstaller. Then I started to use the “Remove datas from registry” (or similar, I don’t remember well) checking the checkbox during the installation of the newer version over the older. In both cases I resloved the problem, but obviously the second way is better and faster.