Windows 11 Comes With Protection Built In
Unlike older versions of Windows, Windows 11 ships with Microsoft Defender Antivirus already installed and active. For many home users, this is genuinely adequate protection. But whether it's enough for you depends on how you use your computer — and for small businesses, the answer is usually that additional protection is worth adding.
1. What Does Microsoft Defender Actually Do?
Microsoft Defender provides real-time scanning for viruses, malware and ransomware. It updates automatically through Windows Update, integrates with Windows Security to show your overall protection status, and includes a basic firewall and browser protection in Edge. It's not a token piece of software — it consistently scores well in independent antivirus tests.
2. When Defender Alone is Probably Fine
For home users who keep Windows updated, don't open unexpected email attachments, don't download software from unofficial sources, and mainly use mainstream websites — Defender is likely sufficient. Microsoft has invested significantly in it and it's no longer the weak option it once was.
3. When You Should Add Extra Protection
For small businesses and anyone handling sensitive client data, financial information or medical records, adding a dedicated business endpoint security tool on top of Defender is worth doing. Business-grade tools add features like centralised management across multiple devices, more detailed threat reporting, and faster response to new threats. For home users who want extra peace of mind, a well-regarded free option like Malwarebytes as a second scanner is a reasonable addition.
4. What Antivirus Can't Protect Against
No antivirus catches everything. Social engineering attacks (where someone tricks you into handing over access or credentials) bypass antivirus entirely. Keeping software updated, using a password manager, enabling multi-factor authentication and being cautious with email attachments are all more important than which antivirus you run.
5. The Most Important Thing You Can Do
Keep Windows 11 updated. Most successful malware attacks exploit vulnerabilities that already have patches available. An up-to-date Windows 11 with Defender running is meaningfully more secure than an out-of-date system with a premium antivirus installed.
Based in Surrey? We Can Help
We support home users and small businesses across the whole of Surrey remotely — including Epsom, Guildford, Dorking, Kingston, Woking, Reigate and Cobham. View all Surrey areas →
Related Guides & Services
What is Ransomware?
Good antivirus is one layer of ransomware protection — here's the full picture.
Windows 10 End of Life
If you're still on Windows 10, no antivirus compensates for an unsupported OS.
Cyber Security Services
We configure antivirus and security tools remotely for homes and businesses.
Frequently Asked Questions
Is Windows Defender good enough for home use?
Yes, for most home users. Microsoft Defender is actively maintained and scores well in independent tests. Keep Windows updated, be cautious with downloads and email attachments, and Defender handles the vast majority of threats.
Does Windows 11 need a paid antivirus?
Not necessarily. Many paid antivirus products offer marginal improvement over Defender for home users. If you want extra protection, a free second-scanner like Malwarebytes is a better value option than most paid alternatives.
What antivirus do you recommend for small businesses in Surrey?
For small businesses we recommend a managed endpoint security solution such as Malwarebytes for Teams or Microsoft Defender for Business, which adds centralised management on top of built-in Windows protection.
Can antivirus stop ransomware?
Modern antivirus tools include behaviour-based detection that can block ransomware before it encrypts files. However, antivirus alone is not sufficient — backups, patching and MFA are equally important layers of protection.
How do I check if Windows Defender is active on my PC?
Open Windows Security from the Start menu and check that Virus & threat protection shows green. If it's showing warnings or has been disabled, contact us — this can be a sign of an existing infection.