I have a Vista SP1 that I only boot weekly to update if I'm not traveling. I'll check for the last update after 30 minutes or so and it will be days, still not having updated. Yes, I do have automatic updates enabled and I realize it's a moot point if I just manually update but it is the first A-V I've ever had that doesn't update definitions almost immediately. Kind of the principle of the thing! Is there perhaps a problem? Thank you!