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Common Antivirus Myths, Debunked

A lot of the advice people repeat about antivirus software is years out of date, or was never quite true. Here are the myths we hear most often, and what independent testing and the products' own documentation actually show.

"Windows Defender is all you need"

Microsoft Defender, built into Windows, has improved enormously and now performs well in recent independent malware protection tests. For a careful user who keeps Windows updated, uses strong passwords and backs up files, it can be enough. What it doesn't offer is protection for Macs and phones from the same vendor, a bundled VPN or password manager, or parental controls — which is what most paid suites add. Some of Defender's best protections, such as Controlled folder access against ransomware, are also off by default.

"More expensive always means better protection"

Not reliably. Much of the price difference between plans pays for extras — a VPN, cloud backup, identity monitoring — rather than a better detection engine. Within the same brand, the free and paid versions often use the same engine. Price buys features and device coverage; check whether you need them.

"A slower computer means better protection"

This is backwards. Independent performance tests show a real spread between products, and some of the best-protecting suites are also among the lightest. If a product noticeably slows your computer, that's a cost, not proof it's working harder.

"You only need protection if you visit risky sites"

Malware also arrives through fake invoices and delivery notices in email, malicious ads on legitimate sites, compromised software downloads and infected USB drives. Careful browsing helps, but it doesn't replace real-time protection and updates.

"Free antivirus is always a trap"

Some free tiers are limited, but reputable free products such as Avast One's free plan and Microsoft Defender provide real-time protection. Paid upgrades mostly add extra features and devices. See our free antivirus shortlist before assuming you have to pay.

"Two antivirus programs give double protection"

They don't. Two real-time engines running at once can conflict, cause false alarms and slow the system. Use one main antivirus; if you want a second opinion, run an on-demand scanner such as the free Malwarebytes occasionally.

"Macs and phones don't need protection"

Phishing, scam websites, malicious apps and fraudulent messages affect every platform. On iPhone, Apple doesn't allow apps to scan other apps, so mobile security apps focus on blocking dangerous links and websites — still useful protection, just different from desktop antivirus.

"Antivirus is only as good as its manual scans"

Real-time protection checks files as they are opened, downloaded or changed, all the time. A scheduled weekly scan is a sensible extra, but the protection isn't "off duty" between scans.

"You can skip uninstalling the old antivirus"

Leftovers from an old security product are a common cause of slowdowns and conflicts after switching. Uninstall the old product first — many vendors offer a dedicated removal tool — then install the new one and run a full scan.

"The first-year price is what you'll pay"

Most antivirus subscriptions renew at a noticeably higher price after a discounted first year. Note the renewal date and price when you buy, and decide in advance whether to keep auto-renewal switched on.

If you already know roughly what you need, go straight to the full rating or a shortlist for your situation.