Five questions, answered in a sentence each
Most people arrive with one specific worry and want it settled quickly. These are the five that come up most often, each with the shortest honest answer. The topic pages carry the longer version, including what to do when the short answer does not apply to your situation.
A slow computer is rarely a sign of infection. Full disk, too many programs launching at start-up, an overdue update or an ageing mechanical drive explain the large majority of cases. Work through the free checks before you assume anything malicious. Read the longer answer.
Opening a link is not the same as losing an account. Harm usually requires a further step: typing a password, approving a verification code or installing something. If you took one of those steps, changing the password on that account is the first move, not a scan. Read the longer answer.
A changed homepage or a new toolbar usually arrived with something you installed on purpose. Bundled extras are the common cause. Removing the extension and resetting browser settings is free and takes a few minutes. Read the longer answer.
Reusing one password across accounts is the single habit that causes the most damage. When a company you signed up to is breached, that password is tried everywhere else. Unique passwords and two-factor authentication matter more than any product you can buy. Read the longer answer.
Nothing in Australian law requires you to buy security software. Windows and macOS both ship with protection switched on. A paid product is a choice about extra features and support, not a legal duty. Read the longer answer.
Every question on this site, by topic
The five topic pages below each gather a group of related questions around one situation. You do not need to read them in order. If your question is not here, the Australian Signals Directorate publishes free guidance for individuals and families at cyber.gov.au, and that is the better place to start for anything this site does not cover.
My computer has slowed down
Why a machine gets slower over time, how to tell ordinary ageing apart from something worse, what the start-up list and disk space have to do with it, whether two security programs can fight each other, and when a slow computer really is worth having looked at.
I clicked a link I should not have
What actually happens when a link opens, which steps matter in the first ten minutes, how to recognise a delivery or bank text that is not genuine, what to do if you entered card details, and where in Australia these things get reported.
Pop-ups, new toolbars and settings that changed on their own
Why search engines and homepages change without being asked, how browser notifications turn into a stream of alarming messages, what the full-screen page claiming your computer has a problem really is, and how to put a browser back the way it was.
Accounts, passwords and logins
How to tell whether a password has been exposed, what two-factor authentication does and does not protect, whether saving passwords in a browser is sensible, and the order to work in when an account has been taken over.
Choosing and paying for security software
What the built-in protection on Windows and macOS already does, what paid subscriptions add, how to compare them without reading marketing copy, what happens when a subscription lapses, and the situations where buying nothing is the correct answer.
Symptom, likely cause, and where to look first
This table matches common complaints to the explanation that is most often correct, and points to the page that covers it. It is a starting point rather than a diagnosis — the same symptom can have several causes, and the topic pages set out how to tell them apart.
| What you notice | Most often caused by | Where it is covered |
|---|---|---|
| Everything takes longer than it used to | Disk close to full, or a drive nearing the end of its working life | Slow computer |
| The machine takes several minutes to become usable after switching on | Programs added to the start-up list by their own installers | Slow computer |
| The fan runs constantly and the case is hot | Dust, a blocked vent, or one program using the processor heavily | Slow computer |
| Search results open in an engine you did not choose | A browser extension installed alongside something else | Browser changes |
| Alerts appear even when the browser is closed | Website notification permission granted at some earlier point | Browser changes |
| A text message about an undelivered parcel | A bulk message sent to many numbers at once | Suspicious links |
| Login attempts on an account you have not used for years | A password reused from a service that was breached | Accounts and passwords |
The free steps worth taking before you spend anything
These apply to almost every situation described on this site, and none of them costs money. Working through them first is also the only way to know whether a paid product would make any difference to your particular problem.
- Install the operating system updates you have been postponing. A large share of the security problems people run into are fixed by an update that was already available.
- Check that the protection already on your machine is switched on. Windows ships with Microsoft Defender Antivirus enabled by default; macOS has its own built-in protections. Neither needs buying.
- Look at what starts automatically when the computer does. Removing programs you no longer use from that list is the single most effective free fix for a slow start-up.
- Make sure something, somewhere, holds a copy of your files. A backup is what turns a serious incident into an inconvenience, and it is the one step no security subscription can do for you.
- Give your main email account a unique password and turn on two-factor authentication. Email is the recovery route for everything else, which makes it the account worth protecting first.
About the order of these steps
They are deliberately sequenced from the cheapest and least disruptive to the most involved. If a step does not apply to you, skip it. Nothing here depends on buying anything, and none of it stops working if you later decide to subscribe to a paid product.
When the problem is not the software at all
A surprising number of questions that arrive phrased as security questions turn out to have hardware or account explanations. A laptop that was fast in 2019 and is slow now may simply be running a modern operating system on a drive designed for a lighter one. A phone that drains its battery after an update is usually re-indexing, not infected. A bank account with an unexplained charge is far more likely to be a subscription you forgot than anything that touched your computer.
This matters because the wrong diagnosis leads to wasted effort and, sometimes, wasted money. A security subscription will not add storage, replace a failing drive, or recover an account whose password is known to someone else. Each topic page says plainly where that boundary lies.
Where a paid product such as Norton AntiVirus Plus fits
Norton AntiVirus Plus is a paid security subscription for Windows and macOS computers. It is one of several products in the same category, and it is the one Crisp Phase has a commercial relationship with, which is why it is named rather than left vague. Paid products of this kind typically bundle their detection engine with extras — a firewall, a password manager, backup space — and with a support channel you can contact when something goes wrong.
They do not, however, change the shape of the problems described on this site. A subscription will not undo a password you typed into a convincing imitation of a bank login page; changing that password will. It will not free up a disk that is full. It will not stop a browser notification stream you agreed to; withdrawing that permission will. Buying software is a reasonable choice when you want a single product covering several machines with support attached, and an unnecessary one when the built-in protection and a few free habits already cover how you use your computer.
Visit the Norton AntiVirus Plus website to read the vendor's own description of what the subscription includes and what it costs in Australian dollars.
Paid affiliate link. ORYNA s.r.o. is paid a commission on sales made through it. The price you pay is unchanged.Reporting a scam or harmful content in Australia
Reporting rarely gets an individual's money back, and it is worth saying so rather than implying otherwise. What it does is feed the pattern-matching that lets these bodies warn others and act against the operations behind it. The organisations below each cover a different kind of problem.
| Organisation | What it is |
|---|---|
| Australian Cyber Security Centre | The Australian Signals Directorate's cyber security arm. It publishes free advice for individuals and small businesses, and runs ReportCyber for reporting cybercrime. |
| Scamwatch | Run by the National Anti-Scam Centre, it collects reports of scams and publishes information about current ones. |
| eSafety Commissioner | Australia's regulator for online safety, with complaint schemes covering cyberbullying, image-based abuse and seriously harmful online content. |
| Office of the Australian Information Commissioner | The national privacy regulator. It handles privacy complaints and administers the Notifiable Data Breaches scheme. |
| Australian Competition and Consumer Commission | Enforces the Australian Consumer Law, including the rules on misleading and deceptive conduct that apply to anyone selling or advertising in Australia. |
Terms you will meet in these answers
Security writing is full of words used loosely. These are the ones that appear on this site, with the meaning intended here.
- Malware
- An umbrella word for software written to do something the person running it would not agree to. Viruses, ransomware and spyware are all kinds of malware.
- Phishing
- A message designed to get you to hand over a password, a code or payment details by imitating an organisation you trust.
- Potentially unwanted program
- Software that is not strictly malicious but installs alongside something else and changes settings you did not intend to change. Most toolbars and search redirectors fall here.
- Two-factor authentication
- A second check beyond the password, usually a code from an app or a prompt on a device you own. Often shortened to 2FA.
- Real-time protection
- The part of a security product that inspects files as they are opened or downloaded, rather than only when you run a scan.
- Definitions
- The reference data a security product uses to recognise known threats. Modern products update these quietly in the background.
How these answers are written and checked
Questions are chosen from the phrasings people actually use when they search, grouped so that related worries sit together rather than being scattered across pages. Each answer is checked against the published guidance of the relevant official body — most often the Australian Cyber Security Centre, Scamwatch or the vendor's own documentation — and where a factual claim depends on a source, that source is linked so you can read it yourself rather than taking this site's word for it.
The site does not run tests, benchmarks or comparisons of its own, and it does not publish scores or rankings. Where a paid product is mentioned, it is a product ORYNA s.r.o. has a commercial relationship with, and that is stated on every page where the link appears. The About page sets out the method in more detail, including how often pages are revisited.
A few more questions
For many people who browse, bank and email on a machine kept up to date, the protection included with Windows covers the common cases without anything added. A paid subscription becomes worth considering when you want extra features bundled together, cover across several devices and people, or a support line to call. It is a decision about convenience and scope rather than a gap that must be filled.
Two products both watching every file in real time can interfere with each other and slow the machine noticeably. Windows generally handles this by standing its own real-time protection down when another product registers itself, but leftovers from an uninstalled product can still cause conflicts. Keeping one active real-time product is the sensible arrangement.
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Because naming it is more honest than describing an unnamed product you cannot check. ORYNA s.r.o. is paid a commission on sales of Norton AntiVirus Plus made through the link on this site, and saying so plainly lets you weigh the recommendation accordingly. The affiliate disclosure explains what the arrangement does and does not influence.