Albert,
There is yet another thing if you want a clean re-install. Please, close the Viewer and erase the entire folder \%appdata%\Roaming\Remote Utilities Files\ then start the Viewer again.
Warning: your address book file/files are in that folder, specifically the general address book (connections_4.xml) and maybe other books that you created. I recommend that you copy these books elsewhere for importing later after you've finished.
Hope that helps.