Windows remains the dominant desktop operating system worldwide, accounting for 56.61% of desktop usage in June 2026, with Windows 11 representing nearly 70% of Windows desktop usage. Its widespread use also makes Windows devices attractive targets for cybercriminals.
The threat landscape also shows why relying on basic protection alone may not be enough. Microsoft reports that its security systems block around 4.5 million new malware attempts every day, while more than half of cyberattacks with known motivations involve extortion or ransomware.
So, if Windows already includes Windows Security and Microsoft Defender, do you still need separate antivirus for PC? The answer depends on how you use your device, the threats you face and the level of PC security you expect.
What Is Windows Security and What Does Microsoft Defender Do?
Windows Security is the built-in security centre in Windows. It brings together several protection capabilities, including Microsoft Defender Antivirus, firewall controls, account protection, device security and other security settings.
Microsoft Defender provides core antivirus protection, including malware scanning and real-time protection. It can monitor files, applications and activity on the device to identify potentially harmful behaviour.
For many users, this provides a solid baseline when Windows is updated, security features are enabled and safe browsing practices are followed.
However, dedicated antivirus software may offer broader protection. Third-party security suites may provide additional layers for web protection, ransomware protection, privacy, identity security, banking protection or cross-device management.
Is Windows Security Enough for PC Security?
For basic users, Windows Security may be sufficient for essential malware protection. It is integrated into Windows and receives regular security updates without requiring a separate subscription.
But protection is only one part of PC security. Cyberattacks increasingly combine multiple techniques, including phishing, malicious websites, credential theft, social engineering and ransomware.
Microsoft’s 2025 Digital Defense Report found that 28% of investigated breaches began with phishing or social engineering, while 18% involved unpatched web assets. A dedicated antivirus for PC can therefore be useful when you want additional security capabilities beyond the Windows baseline.
What Does Antivirus Software Add Beyond Microsoft Defender?
The biggest difference is usually the breadth of the security package rather than simply whether malware can be detected.
Malware protection
Both Microsoft Defender and reputable third-party products provide malware protection. Compare independent tests for detection quality, false positives and performance. Look for products that combine signature-based detection with behavioural analysis, cloud intelligence and other modern detection techniques.
Ransomware protection
Ransomware protection has become increasingly important because modern attacks can encrypt files, steal sensitive information or both. A dedicated antivirus suite may add features such as protected folders, suspicious-file behaviour monitoring, exploit protection and additional recovery or remediation capabilities.
Real-time protection
Real-time protection continuously monitors activity rather than waiting for a scheduled scan. This can help identify suspicious downloads, applications and file behaviour before they cause damage. Check whether real-time protection covers downloads, applications, websites and other common attack surfaces.
Web and phishing protection
A modern antivirus for PC should go beyond scanning files. Web protection can help identify malicious websites, phishing pages and dangerous downloads. This is particularly relevant because attackers increasingly use social engineering to convince users to hand over credentials or install malicious software.
Do You Need Both Windows Security and Antivirus Software?
Installing multiple antivirus engines with overlapping real-time functions is usually unnecessary and may cause conflicts or performance issues. The better approach is to understand what each provides.
If you install reputable third-party antivirus software, it may become the primary antivirus protection while Windows Security continues providing access to other security controls. The choice depends on your risk profile. Windows Security may be enough if you:
- Browse trusted websites.
- Keep Windows and apps updated.
- Avoid suspicious links and downloads.
- Use strong passwords and MFA.
Consider dedicated antivirus if you download frequently, bank online, handle sensitive data, need stronger protection, or secure multiple devices.
How Should You Choose an Antivirus for PC?
Don’t choose an antivirus for PC simply because it is popular or heavily advertised. Compare the protection it provides against the way you actually use your device. Look at:
Malware detection: Check independent test results and detection capabilities.
Ransomware protection: Look for behaviour-based protection and safeguards against unauthorised file changes.
Real-time protection: Confirm that protection operates continuously across relevant attack surfaces.
Web protection: Check whether the product can identify phishing sites, malicious URLs and dangerous downloads.
Performance: Security should protect your system without causing unnecessary slowdowns.
Updates: Threat intelligence must be regularly updated to address emerging threats.
Support: Consider the quality and availability of technical support, particularly if the device is used for work or financial activity.
Solutions such as Quick Heal Total Security can be considered when you want a dedicated security layer alongside the protections built into Windows.
Windows Security vs Antivirus Software: Which Should You Choose?
The question is not whether Windows Security or third-party antivirus is better, but whether your setup provides enough protection for your risks. Windows Security and Microsoft Defender offer a solid baseline, while dedicated antivirus software can add broader malware protection, ransomware protection and web security.
While cyber threats evolve, a reputable antivirus for PC can strengthen overall PC security alongside Windows’ built-in protections. Quick Heal Total Security is one option to consider when looking for additional protection. Compare features, independent test results and your usage needs before choosing.
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