I often forget to update nod for a couple of days. Does this program need to be updated every day? Not should it, but since I already did forget to in the past, could there have been significant risks? Like very smart viruses going in to my computer and changing the codes for the program so when it is updated it is already too late because the AV got compromised already. Like it's faking it's own updates because it has already been taken over by the virus, and all of the scans I did after the updates are all fake too because the program is under control? Are there any virus out there that can control the security software so that there is nothing you can do because the anti virus programs themselves are compromised? But with the updates, the heuristics are supposed to help protect viruses that are not in the signature data base, so even if I updated a few days late it's still ok right?