Personal computers running modern operating systems benefit immensely from active antivirus and cybersecurity protection software. While contemporary operating systems incorporate robust built-in security defenses, Windows Defender tools, and frequent system updates, these native features must be supplemented by user vigilance against sophisticated malware, ransomware, phishing scams, and zero-day exploits. Users who practice extremely safe browsing habits, avoid unverified downloads, and bypass suspicious links face lower threat exposure, but running an active, reputable third-party antivirus program provides a crucial secondary layer of automated defense to safeguard sensitive personal data and financial assets.