Thanks for your reply. Very helpful. You are correct that nothing is wrong with the MyBookLive unit. I found that setting up access on XP is a little different from setting up access on 7. On XP, I had to open WD Quick View and select Map. Then I had to ensure there was a password assigned to the share I had created for my daughter to use. After that, XP was able to access MyBookLive wirelessly and open the share as well as the public share.
On Win 7, I did not have to go through the step of mapping MyBookLive.
Thanks again.