You have part of this program in "program files", but in your %APPDATA% too. (in the explorer, type %APPDATA% in the URI bar. Or try (if you don't find it) to execute "explorer %APPDATA%" without the ". Be carefull to respect the case!)
And, you have some configuration options in the registry, but I don't advice you to look them if you don't know exactly what you do. Use a software who can do it, like ccleaner.