Unfortunately I am well versed in XP and not in the Vista OS, so bear with me.
You could try the dump file and see what happened.
Check the Errors in the Event Viewer of the Administrative Tools (Control Panel) and check out the Event ID to trace the events.
Odd, because the ZA will install in the safe mode under the XP OS, so maybe there is some difference between the XP and the Vista. Did you uninstall the ZA first before trying to install?
Also, since I'm guessing this is a new PC, did you run the cleanup tools for the previous security applications (Norton or Symantec, McAfee, TrendMicro, etc) before installing the ZA? There could be some remmants from the previous security interferring with the ZA.