For those of you encountering the problem, please try this:
1) Make sure Hero Lab is closed
2) In any web browser
except internet explorer, download this file:
http://www.wolflair.com/download/hp/pathfinder.hl
3) Double-click the file once downloaded and follow the prompts to import it
4) Try to load the Pathfinder game system
Does it load properly, or do you get the same error as before, or a different error?
Thanks for your patience and help resolving this issue.