This is a casino application. It means that just like any other application, it features an uninstaller module that can be accessed from the Add or Remove programs in Control Panel. You can try to install the client again, and it will be available in the uninstall list in case it isn't there.
Alternatively, try using Revo Uninstaller. Even if it can't uninstall the application normally, it will force it to uninstall by wiping out all traces of its presence from the system.