This was supposed to be a Kubuntu install from here:
http://www.kubuntu.org/getkubuntu/download
There is a link near the bottom to try Wubi.
So I clicked that, and all appeared to have gone well for the installation. However, now when it boots up, it wants me to enter my Username and Password. It does not accept anything I attempt to enter. Indeed, I have no idea what it wants. I tried my two Windows IDs, neither of which has a password. I also tried "root" with no password. So how can I register a username without being able to log in in the first place? Is there some other workaround?

BTW - Nothing I have seen so far would seem to indicate that I installed Kubuntu and not Ubuntu. I am wondering if I really got Kubuntu; but that is a relatively minor issue compared to my inability to log on.