Windows 10/11
Turn on Microsoft Defender (built-in).
Start → Windows Security → Virus & threat protection → ensure Real-time protection is On. Microsoft SupportSchedule a scan weekly in Windows Security or Task Scheduler. Microsoft Support
Keep Windows updated (monthly patches). Settings → Windows Update → Check for updates. Microsoft Support
Mac
Rely on built-in layers: Gatekeeper, Notarization, XProtect, plus the firewall. Apple Support+1
Only install trusted apps (App Store or identified developers). Apple Support
Keep macOS updated (Security Response & patches). Microsoft Support
Why this helps: Up-to-date OS + built-in protections block most threats; scans catch the rest.
Source:Windows Security overview: https://support.microsoft.com/windows/stay-protected-with-the-windows-security-appVirus & threat protection: https://support.microsoft.com/windows/virus-and-threat-protection-in-the-windows-security-appApple: Protect your Mac from malware: https://support.apple.com/guide/mac-help/protect-your-mac-from-malwareApple Security Guide (layers): https://support.apple.com/guide/security/protecting-against-malware