Here is a secret for you: You do not need AV software.

Actually, let me clarify that statement. You might need AV software if you are a very uninformed user who likes to open email attachments from unknown people or download lots of useless software from questionable sources. However, if that person I described is not you, then you do not need AV software, and it is just taking system (and apparently network) resources.

The reason you don’t need AV software is because there are only two ways to get virus on your computer: 1) Network-related software you use is exploited. 2) You willingly (although accidentally) run the bad software yourself. Yes, I’m simplifying things, but it is hardly any more complicated than this. Since you are an informed user, you have learned not to run bad software, so #2 doesn’t apply to you; and since you patch your system regularly (right?), #1 is very unlikely.

However, there may be a tiny window between the time that an exploit is found and the patch being made available where you could potentially be vulnerable. Theoretically, AV software can ‘protect’ you in this scenario since virus definitions are made available sooner than patches. The solution here is, again, to be an informed user. If a piece of software you use becomes vulnerable to a new exploit, you should know about it and take the necessary precautions yourself during the time before a patch is released, in order to protect your system. This will protect you much better than any AV software will, and it’s not difficult since there are not many pieces of software which could even be exploited (the main ones are your browser and other internet-related apps).

Now, I’m a user of Linux, BSD, and (rarely) Windows. I have been running Windows for years without a hitch by being an informed user. Actually, I also usually install patches long after they are available because I turned off the automatic download/install feature (I like to know what’s using my internet connection), and for some reason it doesn’t even notify me of the availability of patches so I often forget. Nevertheless, I’ve never been compromised mainly because I don’t run questionable software or read unknown emails, and the security of the software (and patches) has been good enough.

In my opinion, AV software is a scam. It might be useful for grandmas and other clueless users who open email attachments indiscriminately, but I cannot see how anyone informed enough cannot also manage their own security. Not that all users are informed, but I should think that you should be informed enough to be able to live without AV software quite easily. Bottom line: run a firewall (preferably a hardware firewall), patch often, be informed, and ditch the AV software.