You can't convert a test drive to regular by registering anyhow, you have to
remove it before installing the regular version.
Haven't a clue why upgrading to Tiger would cause this. Since it isn't
really the test drive, I would at least see if the basic troubleshooting
tips kick it back into shape, especially repairing permissions and
regenerating the settings files, and rebooting.
Re settings files for Word--basically the same for the other apps:
http://word.mvps.org/MacWordNew/DamagedPrefs.htm
(hit refresh a few times in Safari, or use a different browser)
If y'all didn't remove the test drive before installing the full version,
and it still is on your hard drive, then you might need to remove it now,
which I think requires removing all versions and reinstalling. I'm not sure
whether the Remove Office tool offers the option of *just* removing the test
drive.
http://word.mvps.org/MacWordNew/RemoveReinstall.htm
(hit refresh a few times in Safari, or use a different browser)
Hope that helps. Did you both upgrade to 10.4.2? I don't think this problem
has been reported before this.