Just realized something about OA Free: as far as I can tell, it does very little to prevent malware persistence. e.g. say some application is compromised. Online Armor can prevent it from doing anything nasty on the spot, or from executing a nasty program on the spot. But if it drops a file somewhere in your home directory, then creates an autorun entry in the registry telling Windows to run the nasty before OA starts? Looks like that's it. Can anyone confirm this? How many other freeware FW/HIPS have such limited autostart protection? (And mind, I am kicking myself for not noticing this, because it says on the OA website that the free version's autostart protection is limited. D'oh!) Edit: Hmm, UAC probably takes care of this issue on Windows Vista and 7 (to an extent anyway). On XP, though, users of the free version may not be very well protected.