Flash traffic – the new Hero Lab updates for Pathfinder will crash your Hero Lab if you are on Windows XP, Vista, and maybe other platforms. Don’t update. If you have already updated and are crashing, there is a Lone Wolf forums messageboard thread with details and a workaround which is to download the older Pathfinder datafile and import it.
The error for Google reference is:
ACCESS VIOLATION
Address: 0x005ab17d
Type: bad read
Geek Related 
There is now a fix; I updated successfully. Good quick work from Lone Wolf, full techie description of the issue is in the linked thread above.