Resque, are you trying to open this from the desktop or the start screen?
Have you tried to customize the run options in the shortcut?
You will likely have to have this application set to compatibility mode for XP, and set to run as administrator, and even then you may need to either turn off some UAC settings or make sure that Kiwi is installed in the user folder of the user that is going to be online and running the syslog server.
Optionally, Win 8 comes with free Hypervisor installtion, and you can setup a virtual XP box or Win2k8 box or whatever and run it there.