Question: The data upgrade process has failed: to build ... from ...; diagnostics = "..."
Answer: The Foxhound post-setup process was unable to copy and upgrade the data stored in a previous version of the Foxhound database.
This doesn't stop the new installation, but it does mean the history of Monitor samples and alerts did not get copied over to the new installation,
nor did your Foxhound option and alert settings.
More information may be found in this file on Windows XP:
C:\Documents and Settings\All Users\Application Data\RisingRoad\Foxhound1\setup\post_setup_trace.txt
and on Vista:
How do I install a new version of Foxhound?