{"slug":"kaspersky-vs-windows-defender","title":"Kaspersky vs Windows Defender","url":"https://www.aversusb.net/compare/kaspersky-vs-windows-defender","faqCount":5,"faqs":[{"question":"Is Windows Defender enough for basic home use?","answer":"Yes. Windows Defender's 97.2% detection rate is sufficient for most home users who practice safe browsing habits. However, if you frequently download files, visit risky websites, or handle sensitive data, Kaspersky's 99.8% detection rate and 4 hourly updates provide materially better protection. The gap matters most for high-risk users."},{"question":"How much will Kaspersky slow down my computer?","answer":"Kaspersky uses 215 MB of RAM at idle vs Windows Defender's 85 MB—a 150% difference. On systems with 8GB+ RAM, this is negligible. On older machines with 4GB RAM, you may notice 5-10% slowdown in everyday tasks. Windows Defender is the clear winner for older/slower systems."},{"question":"Why is Kaspersky more expensive than Windows Defender?","answer":"Kaspersky charges $79.99/year for advanced features: 24/7 support, included VPN (normally $10-15/month), password manager, parental controls, and 4x faster threat updates. Windows Defender is free but lacks these extras. You're paying for convenience and premium protection, not just antivirus detection."},{"question":"Should I remove Windows Defender if I install Kaspersky?","answer":"Yes. Kaspersky's installer will automatically disable Windows Defender to prevent conflicts. Running both simultaneously creates performance issues and can trigger false positives. During installation, select 'Yes' to disable Windows Defender when prompted."},{"question":"Which detects more ransomware attacks?","answer":"Kaspersky detects 98.7% of ransomware samples in 2025 tests vs Windows Defender's 94.3%—a 4.4 percentage point advantage. Kaspersky's behavioral analysis and machine learning models catch more zero-day ransomware variants. For ransomware specifically, Kaspersky's edge is more pronounced than its general malware advantage."}],"faqPageSchema":{"@context":"https://schema.org","@type":"FAQPage","@id":"https://www.aversusb.net/compare/kaspersky-vs-windows-defender#faq","url":"https://www.aversusb.net/compare/kaspersky-vs-windows-defender","inLanguage":"en-US","name":"Kaspersky vs Windows Defender — FAQ","description":"Frequently asked questions about Kaspersky vs Windows Defender","dateModified":"2026-06-24T10:46:55.191Z","author":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"},"publisher":{"@type":"Organization","@id":"https://www.aversusb.net/#organization","name":"A Versus B"},"isPartOf":{"@type":"Article","@id":"https://www.aversusb.net/compare/kaspersky-vs-windows-defender#article"},"license":"https://creativecommons.org/licenses/by/4.0/","speakable":{"@type":"SpeakableSpecification","cssSelector":["#faq",".faq-item"]},"mainEntity":[{"@type":"Question","name":"Is Windows Defender enough for basic home use?","acceptedAnswer":{"@type":"Answer","text":"Yes. Windows Defender's 97.2% detection rate is sufficient for most home users who practice safe browsing habits. However, if you frequently download files, visit risky websites, or handle sensitive data, Kaspersky's 99.8% detection rate and 4 hourly updates provide materially better protection. The gap matters most for high-risk users.","inLanguage":"en-US","url":"https://www.aversusb.net/compare/kaspersky-vs-windows-defender"}},{"@type":"Question","name":"How much will Kaspersky slow down my computer?","acceptedAnswer":{"@type":"Answer","text":"Kaspersky uses 215 MB of RAM at idle vs Windows Defender's 85 MB—a 150% difference. On systems with 8GB+ RAM, this is negligible. On older machines with 4GB RAM, you may notice 5-10% slowdown in everyday tasks. Windows Defender is the clear winner for older/slower systems.","inLanguage":"en-US","url":"https://www.aversusb.net/compare/kaspersky-vs-windows-defender"}},{"@type":"Question","name":"Why is Kaspersky more expensive than Windows Defender?","acceptedAnswer":{"@type":"Answer","text":"Kaspersky charges $79.99/year for advanced features: 24/7 support, included VPN (normally $10-15/month), password manager, parental controls, and 4x faster threat updates. Windows Defender is free but lacks these extras. You're paying for convenience and premium protection, not just antivirus detection.","inLanguage":"en-US","url":"https://www.aversusb.net/compare/kaspersky-vs-windows-defender"}},{"@type":"Question","name":"Should I remove Windows Defender if I install Kaspersky?","acceptedAnswer":{"@type":"Answer","text":"Yes. Kaspersky's installer will automatically disable Windows Defender to prevent conflicts. Running both simultaneously creates performance issues and can trigger false positives. During installation, select 'Yes' to disable Windows Defender when prompted.","inLanguage":"en-US","url":"https://www.aversusb.net/compare/kaspersky-vs-windows-defender"}},{"@type":"Question","name":"Which detects more ransomware attacks?","acceptedAnswer":{"@type":"Answer","text":"Kaspersky detects 98.7% of ransomware samples in 2025 tests vs Windows Defender's 94.3%—a 4.4 percentage point advantage. Kaspersky's behavioral analysis and machine learning models catch more zero-day ransomware variants. For ransomware specifically, Kaspersky's edge is more pronounced than its general malware advantage.","inLanguage":"en-US","url":"https://www.aversusb.net/compare/kaspersky-vs-windows-defender"}}]}}