A buyer's guide for home computers in New Zealand
Does your home computer need extra antivirus, and how would you choose it?
Nexaline explains desktop antivirus for households in plain terms. It covers the protection already built into Windows and macOS, when a separate product might be worth a look, how to compare products on evidence, and how to recognise a fake security warning. It is published by BATI ENERGIA and paid for by affiliate commission, explained in the box below.
The short answer
- Most home computers already have antivirus. Current versions of Windows include Microsoft Defender Antivirus, and macOS has its own built-in malware checks. Many people never need anything more.
- Updates matter more than brands. An operating system that still receives security updates, with automatic updates switched on, does more for a household than any single product.
- A separate product is a choice, not an obligation. There is no law in New Zealand requiring a household to buy security software. People choose one for extra features, a different interface, or support from a vendor.
- Compare on evidence. Independent lab results, clear renewal terms and an easy way to cancel tell you more than a product's own claims.
What is already on your computer
A computer bought in the last few years usually arrives with malware protection switched on. On Windows 10 and Windows 11 it sits inside the Windows Security app, which brings together Microsoft Defender Antivirus, the firewall and a few related settings. On a Mac, Apple builds checks into the operating system that look at apps when they are opened and block known malicious software. Apple describes these layers in its Platform Security guide.
Built-in protection costs nothing extra and is updated by the company that makes the operating system. Its limits are mostly about extras rather than core detection, such as parental controls across several devices or one dashboard for a whole family. Whether those extras are worth paying for depends on the household, which is the question the guide Do I need antivirus on my computer? works through step by step.
One thing built-in protection cannot fix is an operating system that has stopped receiving updates. Microsoft's product lifecycle pages list when each version of Windows stops being supported. After that date, third-party antivirus is no substitute for moving to a supported version, because weaknesses in the system itself stay unpatched.
Five things to check before you pay for anything
If you are weighing up a paid product, these checks take a few minutes and filter out most of the problems people run into later.
- Confirm your operating system is supported and set to update automatically. This comes before any purchase.
- Look up the product in recent reports from an independent testing lab such as AV-TEST or AV-Comparatives, rather than relying on the vendor's own summary.
- Find the renewal price, not just the first-year price, and note whether the subscription renews automatically.
- Check how to cancel and how to get a refund, in writing, before you enter card details.
- Make sure the product covers the devices you actually own. Some plans are for one computer; others cover several.
The full method, with the questions to ask at each step, is in How to choose antivirus for a home computer.
Ways to protect a home computer, side by side
Rather than ranking brands, this table compares the broad types of protection a household can choose between. Each has a place.
| Type | What it is | What it costs | Worth checking |
|---|---|---|---|
| Built-in protection | The malware protection that comes with Windows or macOS. | Included with the operating system. | That it is switched on and that the system still gets updates. |
| No-charge third-party antivirus | A basic product from a security vendor, offered without a fee. | No fee for the basic version; paid upgrades are usually promoted inside the app. | How often it asks you to upgrade, and what data it collects in return. |
| Paid antivirus | A vendor's core protection with support and some extras. | A subscription, usually billed yearly. | The renewal price, auto-renewal settings and cancellation steps. |
| Security suite | Antivirus bundled with tools such as a password manager, VPN or parental controls. | A larger subscription, often covering several devices. | Whether you would use the extras, and whether you already have them elsewhere. |
The product this site covers: Avast
Avast is antivirus software for computers. The links on this site go to the vendor's desktop offering for home users; Avast's mobile apps and its business products are outside what Nexaline covers. Signing up on the vendor's site involves creating and activating an account.
That is the extent of what this site can state about the product. Which operating systems it supports, what each version includes, the price in New Zealand dollars and how renewals work are not covered by the information Nexaline works from, so check them on the vendor's own pages, using the checklist above, before you sign up. The Avast overview sets out the questions worth asking.
Paid link: BATI ENERGIA earns a commission if you create and activate an account. It opens the vendor's site in a new tab.
Warnings that are not what they seem
Fake security warnings are a well-known scam. A web page, pop-up or phone call claims a problem has been found and urges you to call a number, install something or pay. Real security software does not ask you to phone a stranger, and a website cannot scan your computer simply because you visited it.
- Close the browser tab or window. If it will not close, restart the computer.
- Do not call phone numbers shown in a pop-up, and do not let anyone you did not contact connect to your computer remotely.
- If you have already paid or given access, contact your bank first, then see the help options below.
The guide How to recognise fake virus warnings covers the common patterns calmly and in more detail.
Where to get help in New Zealand
These organisations give free, independent guidance, whether or not you buy anything.
- Own Your Online
- Everyday security advice for individuals and families from the National Cyber Security Centre (NCSC), including how to report a cyber security problem.
- Netsafe
- An independent online safety organisation that offers advice and support with online scams, harassment and other online harms.
- Consumer Protection
- Government guidance on your rights when buying goods and services, including subscriptions and refunds.
- Office of the Privacy Commissioner
- Information about the Privacy Act 2020 and how to raise a privacy complaint.
Guides on this site
Common questions
Does Nexaline test antivirus products?
No. This site does not run its own laboratory tests, and it does not publish scores. It points to independent testing organisations and explains how to read their results.
Why does the site only link to one product?
Because Avast is the product BATI ENERGIA has an affiliate arrangement for. The general guides are written to be useful whichever product you choose, including none at all. The About page explains how coverage is decided.