Yes it was bound to happen in the learning process and maybe a bug also. I had installed Grub boot manager and followed the instructions to boot into Ubuntu.
But Micro shaft was having none of it. The result was that I had a problem and had to reinstall Hardy which then wouldn't agree with my password. Ruddy 'ell said I but on the basis of, if at first you don't succeed I downloaded Hardy again and installed it successfully.
The result is a more informative desktop with a Toshiba icon which gives me all? the important stuff that is on t'other partition. (I think) I do of course have to reinstall other software including Skype plus the Ubuntu updates.
My general feeling is that this latest version is better so my setback has actually been a step forward
and fingers crossed.