The x2goclient installer for Windows does come with an uninstall-script, but when I go to "Add or remove programs" on Windows XP or "Uninstall a program" on Windows 7, it does not list x2goclient. The Windows installer for x2goclient should add the needed registry keys or whatever mechanism Microsoft uses to allow uninstall from the control panel.
Anders Bruun Olsen
Det Danske Sprog- og Litteraturselskab
(Society for Danish Language and Literature)