I have Vista 32 with current windows update and Nitro PDF Pro most recent fully registered version all was working properly.
I then installed ZoneAlarm Security Suite version:9.3.037.000
Now it fails when I start Nitro PDF I get a message "The service does not have sufficient privileges. Please reinstall." I reinstalled, and as expected, it still fails with the same message. All other programs I have tested are OK aside from the Firefox issue I reported in another thread. I have also opened a case with Nitro PDF support.