Choosing An Antivirus Program

Antivirus programs are the last line of defence for keeping your computer safe from viruses.

The purpose of these tools is to detect viruses on your PC and neutralise them. There can be a bewildering choice of software to choose from, so this page is here to help demistify the topic and guide you into installing the best antivirus program for you.

Jump straight to topic:

What does an antivirus program do?

Antivirus software

At their core, antivirus programs sit silently on your PC constantly watching for any viruses and deleting any they find. You should rarely even notice it running - normally they'll only pop up an alert if it finds anything suspicious.

As well as watching for viruses many antivirus programs do other tasks too, such as preventing personal data from leaving your computer, securely remembering all your passwords for you, or alerting you if you visit a dangerous website.

Does my phone need antivirus?

All computers will benefit from antivirus - not just those running Windows, but Apple Macs & Linux machines too. Some antivirus tools also exist for mobile phones (especially those running Android) although the need for these and their effectiveness is still debated.

Who makes antivirus software?

There's lots of antivirus products on the market these days. We discuss how to choose between them further down this page, but some of the popular ones include:

You can buy antivirus either to download online or at your local computer store.


Only ever buy well-known antivirus software, and only from reputable stores. Never click any pop up web messages about antivirus - these may well be a virus themselves.

If you ever want to know if a product is a legitimate antivirus tool or not then see if it's listed on or These websites also allow you to research the best antivirus program in terms of detection rates and performance impact on your computer.

Why do I have to keep renewing it every year?

Antivirus software works by searching your computer for "virus signatures" (ie, the unique fingerprints of viruses) . When you buy antivirus software it's effectively these updates that you're subscribing to.

If you didn't renew your subscription (or buy a new product) each year then, since new viruses are being released constantly, you'll stop getting these updates & your software will effectively stop working.

How do I choose the best antivirus to buy?

There are lots of different antivirus tools on the market, many of which use baffling technical terms and marketing techniques to bamboozle users with flashy messages. Unless you work with computers regularly then working out which is the best antivirus program for you can be extremely confusing!

Paid-for vs free antivirus

The main difference between paid-for and free antivirus is often all the extra features you get - the core aspects of detection and removal is almost always the same. Free software may also repeatedly nag you with adverts.

If all you’re looking for is simple antivirus protection and don’t mind the occasional pop-up advert, then a free tool might be right for you.

Are all antivirus tools as good as each other?

Whilst any legitimate antivirus software is far better than not having any at all, not all tools are as good as each other - whether that's at detecting viruses, removing them once they’ve been found, or at having minimal impact on your computer’s performance.

For most users the differences aren't a big consideration so you'll be fine with any antivirus software. But if you are interested then check out and for up to date independent testing of how effective all the main antivirus tools are.

What features should I look for?

Antivirus tools have evolved over the years beyond simply detecting viruses. There’s now a dizzying array of useful features that many antivirus tools offer - some of which may be useful to you, others less so.

Some of the common features you might find (sometimes known by different but similar names) include:

Confusing isn’t it?! Antivirus companies are constantly inventing new features to keep us buying their products, and many of these features can genuinely be useful in certain circumstances for some users.

Only you know what you need but, if you just want to keep it simple, then a basic antivirus program without any of these features will be absolutely fine.

Money saving tips

If you're opting for a paid-for antivirus tool then as well as shopping around (as you normally would anyway) there's a few extra little tricks you can use to help save some money too:

Multiple licenses

If you have several PCs in your house (and remember that each one should be protected) then you might want to look for software that will allow you to install it on all of your devices. This way you won’t have to buy a separate copy for each computer. Look for terms such as "3 licenses" or "can be installed on up to 3 devices".

Multi-year deals

When buying antivirus software it can be beneficial to look for multi-year deals - buying one that is valid for 2 years often costs not much more than the equivalent for just one year.

Don’t automatically renew

Finally, just like car insurance, it pays to shop around. Towards the end of your license your antivirus program may prompt you to renew for another year. Whilst renewing within the software might be convenient, it’s often the most expensive option - some antivirus vendors will often charge 3 times as much to renew as you can buy the same product for new. Shop around!

Fake antivirus

We've mentioned it on this page already but this is worth repeating... It’s critically important when installing antivirus that you use a known product from a legitimate source.

A virus alert

A popular trick amongst criminals is to scare people into buying worthless "antivirus" software. This is often by displaying a warning message claiming your computer has a virus, either in an advert on a website or even in a pop up message on screen.

If you did buy their "software", then as well as losing money on your credit card, you might also be infecting your computer with the very thing you were trying to protect against - viruses. The software you download is often riddled with viruses that try to make the scammers even more money, for example by redirecting you to their websites that are full of adverts.

Avoiding these scams is fairly easy:

Never buy any antivirus software that pops up on your screen unexpectedly.

Always make sure you buy your antivirus from a reputable high street or internet shop, or directly from a known antivirus manufacturer themselves (see our links above).

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