The upgrade shouldn't have changed anything on your
computer unless you didn't pick "upgrade" when you
installed XP. Did you export it before you upgraded? If
you did you should be able to import it just like you
would do in 98. Under file there is import address book.
I don't think you will be able to restore your favorites
unless you saved them somewhere else. I am not sure why
this wasn't all saved during the upgrade anyway. I just
upgraded yesterday and didn't lose anything.