Hello! I don´t know if this is the solution to your problem, but, in windows vista home basic edition, i had the same problem, i needed cassini because iis admin is not included in this windows version.
DNN in cassini only works by setting port 80 to publish website, so stopping iis service (in vista home basic i can´t manage it, but the service exists and is running all the time!) it works fine. I tried setting config.ini port value, and it doesn´t works. I hope this tip helps you.-
Regards
Fernando G. Martínez