I do believe freespire at one point turned into Linspire, that would mean that the apt-sources would have changed. Also means that you upgrade should have errored out before it started. Seems like Linspire apt resources have also been disabled. Info at link.
http://forum.freespire.org/showthread.php?t=19071
If you don't have any important data on the computer, you might want to install a newer active distro on the computer.