Which antivirus software is best for your pc?

Every Windows PC, laptop or tablet needs security software. And that should include an up-to-date firewall, antivirus and antispyware. That doesn't automatically make your PC secure, of course. Human behavior is such that an online PC or laptop is never entirely safe - but solid security software is a good start, and it will protect you from all but the most sophisticated and well directed attacks.

5 of the best free antivirus programs for Windows PC, laptop or tablet

1. Best free antivirus - Microsoft: Windows Defender :- Windows Defender and Windows Smart Screen are built into Windows 8 and Windows RT and help guard your PC against viruses, spyware, and other malicious software in real time. Windows Defender uses green, yellow, and red color codes to show your PC’s security status.

When Windows Defender detects a suspicious app or other unfamiliar software, it checks it against a Microsoft database to make sure it isn’t known to do anything potentially harmful. Windows Defender keeps track of known malware automatically, but you can also get updated lists whenever you want.

If there’s a red or yellow threat, Windows Defender notifies you and recommends what to do.

2. Best free antivirus - Avast Free Antivirus

Let's go alphabetical and start our look at third-party programs with Avast's Free Antivirus. Here the story is much more positive. Avast matches Windows Defender's decent performance result, and also fails to give any false positives. So far so solid.

But Avast offers much better protection than Windows Defender. Indeed, it offers great protection.

In tests Avast's Free Antivirus found 99 percent of all know threats, which is the industry average. More important is the way Avast deals with zero-day threats.

3. Best free antivirus - AVG Anti-Virus Free Edition

AVG is almost up there with Avast in terms of the all-important protection. Critically, it picked up 98 percent and then 100 percent of unknown threats. Avast is just on top there, but AVG Anti-virus Free Edition's protection performance is excellent. AV-Test awards 5.5/6 for protection.

System performance better than that of Avast, however. AV-Test offers a decent score of 4.5/6, so if you have an underpowered PC this may be a good choice for you, given the protection score.

4. Check Point ZoneAlarm Free Antivirus + Firewall

Check Point's ZoneAlarm Free Antivirus + Firewall antivirus program is another of the big beasts of the free security world. System performance is good once again, and AV-Test offers a performance score of 4.5/6. Even more impressive is the usability score - only Windows Defender has fewer false positives on test than does ZoneAlarm Free. So ZoneAlarm won't slow down your PC or spam you with false positives

But will it help to keep your PC safe? It will - perhaps not as well as AVG and definitely not as well as Avast, but ZoneAlarm offers good protection.

Good then, but not great. ZoneAlarm Free AntiVirus + Firewall is worth a look if you have a low-powered PC, but the protection offered elsewhere is better. We give it 3.5 stars.

5. Panda Security Cloud Antivirus FREE

One other free security program worth your consideration is Panda's Cloud Antivirus FREE. It's a good all rounder offering solid protection. It wasn't quite so good at dealing with zero-day threats, although it outperforms Windows Defender and ZoneAlarm, picking up 95 and 94 percent of threats over the two months. That's just about industry average.

Add to this an excellent usability score in which Panda failed to produce any false positives, and a decent performance score of 4/6 and you can see that Panda is a good free antivirus. We award 3 stars.

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