[chaetodon]

It seems that in the end the install was performed on a system where no Ubuntu disks were present (Ubuntu disk was removed). If true, the whole dualboot discussion is moot. Personally I also encountered registration hell. After some time trying to get it working I just quit on windows and installed Fedora without dual boot on the new system. No windows (XP) traces were left. And everyone (at least in my home) lived happily ever after.