It's not that Windows is especially prone to viruses or that Windows is an unsecured operating system.

Without question, Windows users have always needed an application to protect against computer viruses, spyware, and other types of malware. Otherwise, without a recognized antivirus program, Windows Defender steps up and assumes the role of primary security application. If you have an antivirus product installed, Windows Defender switches to standby mode while your primary tool gets the job done. Avast works closely with Microsoft as a top partner in the Microsoft Virus Initiative (MVI), with both companies collaborating to test each other’s anti-malware tools. Historically, the company has offered the application as a backup to full-suite security products like Avast Free Antivirus. Is Windows Defender Good Enough to Protect My PC? | Avast Logo Ameba Icon Security Icon Security White Icon Privacy Icon Performance Icon Privacy Icon Security Icon Performance Icons/45/01 Security/Other-Threats Icons / 32 / Bloatware removal Icons / 32 / Registry Cleaner Icons / 32 / CleanUp Icons / Feature / 32 / Mac Icons / 32 / Browser cleanup Icons/32/01 Security/Malware Icons/32/01 Security/Viruses Icons/32/01 Security/Other-Threats Icons/32/01 Security/Passwords Icons/32/01 Security/Ransomware Icons/32/01 Security/Business Icons/32/02 Privacy/Browser Icons/32/02 Privacy/IP adress Icons/32/02 Privacy/VPN Icons/32/02 Privacy/Proxy Icons/32/02 Privacy/Streaming Icons/32/03 Performance/Celaning Icons/32/03 Performance/Drivers Icons/32/03 Performance/Gaming Icons/32/03 Performance/Hardware Icons/32/03 Performance/Speed Icons / 32 / Bloatware removal Icons / 32 / Registry Cleaner Win Icons / 32 / CleanUp Icons / Feature / 32 / Mac Icons / 32 / Browser cleanup Icons/60/02 Privacy/02_Privacy Icons/60/01 Security/01_Security Icons/60/03 Performance/03_Performance Icons/80/01 Security/IoT Icons/80/01 Security/Malware Icons/80/01 Security/Passwords Icons/80/01 Security/Ransomware Icons/80/01 Security/Viruses Icons/80/01 Security/Other-Threats Icons/80/03 Security/Business Icons/80/02 Privacy/Browser Icons/80/02 Privacy/IP adress Icons/80/02 Privacy/VPN Icons/80/02 Privacy/Proxy Icons/80/02 Privacy/Streaming Icons/80/03 Performance/Celaning Icons/80/03 Performance/Drivers Icons/80/03 Performance/Gaming Icons/80/03 Performance/Hardware Icons/80/03 Performance/Speed Icons/80/03 Performance/03_Performance Icons/80/02 Privacy/02_Privacy

Running windows defender with avast