ZoneAlarm Free Antivirus + Firewall
Another app that does the job of picking up any intrusions into your system, though the main concern with ZoneAlarm is the limited number of updates it provides a day. To get the full hourly check you'll have to cough up some dough.
AVG AntiVirus Security Free
When you're installing anti-malware software on any device, the reputation of the publisher – and their associated malware labs – is about as important as any factor. AVG has been around for years, consistently does well in PC-based tests, and its Android version is pretty solid. Sadly many of its key features are 14-day trials, and you'll need to stump up for the full version after that time.
360 Internet Security 2013
While it lacks a spam filter, any sort of parental controls and a firewall, this application from the hugely popular Chinese firm Qihoo is still a good shout. Packing three anti-virus engines, it also lets you customise your scan, letting you do a full system check or something a little shorter.
Avast Free Antivirus
Easily one of the most popular anti-virus apps out there, Avast is simple to get going, with a clean interface and a whole host of features. It does a great job of spotting out and killing pesky viruses, but without the common slow down in computer performance often seen with these programmes.
Armor for Android Advanced
This is just about the most full featured security app for Android – giving you Antivirus, 5GB backup, a full permissions check for your phone, a possibly spurious phone signal booster, and loads more. If you're serious about keeping lots of data at hand at all times, you can even opt for a 2TB backup vault, which costs 99¢ per day at press time.
Price: £19.62 | Android
Kromtech MacKeeper Lite
Mac malware is a thing now. There are a number of plausible packages that can keep you safe from it, but we're partial to MacKeeper, mainly because it gives you AV plus a host of other features like anti-theft, backup, and Geek on Demand, which will help you out if you get lost by hooking you up with a knowledgable nerd at the touch of a button.
Price: £34.95 | Mac
We're not sure quite how they do it, but Qihu's free security package looks great, has no ads, and offers a host of features that you'd normally expect to pay a subscription for – virus scanning, hot fixes for system vulnerabilities, app backups and even a neat addition to the notification drawer that brings oft-used functions to the foreground.
Free | Android
iOS is a tricky beast to protect, because Apple doesn't allow apps direct access to the filesystem. But if you're downloading files or attachments it pays to have something that can make sure they're on the level – and that's VirusBarrier. It's simple, but it's cheap and it does exactly what it says it'll do: scan your files for nasties.
Price: 99p | iOS
Despite Apple's stringent review process, we wouldn't put it past an iOS app developer or related agency to one day go rogue. The NSA sniffed Angry Birds traffic, after all. Clueful uses Bitdefender's vast database to tell you exactly what the apps you have installed are doing, and which bits of your personal data they're transmitting. It was booted from Apple's store, but that's OK: you can still get the Android app version from the Play Store, and visit www.cluefulapp.com to check out the free to use iOS web version.
Bitdefender Antivirus Free Edition
The headline feature of this piece of software is its simplicity, along with the fact that it shouldn't hamper the performance on your computer one bit. It's fully compatible with Windows 8 and the neat game mode ensures you're not badgered by updates while you're in the middle of a mass game of Battlefield 3. Updates happen in real-time, which is also a bonus.
Panda Cloud Antivirus Free
Cute, cuddly name aside, this slimmed down piece of anti virus software includes real-time protection from worms and it shouldn't bog down your computer speeds. It'll keep you protected online, plus the constant flow of updates is always welcome.
Free | Download Panda Cloud here
Sophos Anti-Virus for Mac
While all the other pieces of software in this list run on Windows, Sophos is specifically designed for computers running on Apple's OSX. Normally you wouldn't need an anti virus client on your Mac, but a bit of extra protection can't hurt, can it? Sophos ensures you're safe online, keeps your MacBook free of worms and Trojans and it is relatively painless to install.
Free | Sophos