I'm very surprised that you haven't run into other problems on this
system while simply trying to use one copy of Office or the other.
Multiple versions of Word on the same partition (and similarly for the
other Office apps) use the same sets of registry entries in many
cases. Each time you start one version after having used the other
version, you typically get a prompt to rerun the installer because the
registry appears to be corrupted.
I suspect that the section of the registry dealing with COM
configuration of the Office apps has reached a state where some
entries point to Word 2002 and other entries point to Word 2003,
leaving the whole thing inoperable.
The proper solution is to remove both versions completely, and then
reinstall just one version. If you need access to both versions at
different times, you can set up two independent Windows partitions
with dual boot, or you can use something like Virtual PC or VMWare to
set up a virtual machine for the second Office version.
--
Regards,
Jay Freedman
Microsoft Word MVP
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