I would suggest, if you haven't started already, to check out:
http://google-blog-converters-appengine.googlecode.com/svn/trunk/README.txt
On Windows XP, to use these instructions you'll either need to have a
cygwin shell to run the converters, or use the Windows batch scripts
that are included in the installation. A sample usage on a Windows XP
command line would be:
> bin\blogger2wordpress.bat <path_to_blogger_export_file>
Hope that helps.
-JJ.