Antivirus: The Right Criteria to Protect Your Computer Without Getting It Wrong

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AI-generated illustration of a laptop protected by a digital shield, symbol of antivirus protection
Illustration of antivirus protection for a computer

Installing antivirus software remains one of the first security habits to adopt on a computer, whether it runs Windows or macOS. Between free offers, paid subscriptions, and marketing promises, it isn't always easy to find your way around. Here are the criteria that really matter, and the mistakes that often cancel out the protection you paid for.

Why antivirus software remains essential

A computer connected to the internet is exposed at all times: booby-trapped email attachments, compromised websites, infected USB drives, or software downloaded from dubious sources. An up-to-date antivirus program detects and blocks the vast majority of these threats before they can run. However, this is only one building block of protection: it must be paired with regular system updates and a healthy dose of everyday caution.

Free or paid: what really makes a difference

Before comparing offers, it's worth understanding what an antivirus actually is and how it works on a computer. In terms of raw detection, the gap between free and paid software has narrowed considerably: in the real-world test conducted by the independent lab AV-Comparatives between February and May 2026, free solutions like Avast and AVG reached 99.3% protection, compared with 99.5% for Bitdefender and 99.3% for Norton, two paid solutions. The real difference lies more in the add-on features: enhanced firewalls, advanced anti-phishing protection, VPN, or parental controls, which are generally reserved for paid plans.

The criteria to check before choosing

  • The detection rate in recent, independent tests, rather than relying solely on the vendor's promises.
  • The impact on the machine's performance: antivirus software that's too resource-heavy often ends up being disabled by the user, which is worse than not having any at all.
  • How often and how easily the virus database is updated, which should happen automatically.
  • Compatibility with the operating system and any other security software already installed.

The mistakes that cancel out protection

Cybermalveillance.gouv.fr (the French government's cybersecurity assistance platform) points to a simple rule that's often ignored: a computer should never run two antivirus programs at the same time. The two programs perceive each other as a threat, which degrades protection instead of strengthening it. Before installing a new antivirus program, you therefore need to properly uninstall the old one. Another common pitfall: letting a license expire without realizing it, which silently halts virus database updates for weeks.

Pairing antivirus software with good habits

Good software isn't enough if it isn't paired with solid habits. It's worth regularly backing up your data to an external drive, so you can recover it even in the event of a severe infection. It's also a good idea to consult reliable resources to stay informed about threats targeting your computer, and not to hesitate to call in a professional if you suspect a persistent infection, rather than trying random fixes blindly.

Frequently Asked Questions

Is free antivirus software really enough?

For everyday, careful use, yes: independent tests show detection rates close to those of paid solutions. A paid subscription is mainly worthwhile for extra features like a VPN or parental controls.

Should I install several antivirus programs for better protection?

No, that's counterproductive: two antivirus programs active at the same time interfere with each other and can weaken the computer's overall protection.

How can I tell if my antivirus is up to date?

Most software displays the date of its last virus database update on its dashboard; it's a good idea to check this regularly and enable automatic updates.

Sources

This article was written with the help of artificial intelligence. Editorial policy