You're not saying which OS you use, so I'll assume it's either Vista or 7. Uninstall Vue with the config panel. Delete the Vue 9 directory in Programs.

Next, delete the Vue 9 directory in C/users/your name/App Data/Roaming/e-on software

AppData is a hidden folder, so you'll need to make it visible from the config panel, folders (or is it files? My windows is in french) options, and tick the "show hidden folders" box, or something similar in english or in your language.

Then, reinstall.