Investing in antivirus software is debated in cybersecurity, but some form of protection is necessary to guard against threats like malware, spyware, and ransomware. Windows Defender is a free built-in antivirus option for Windows, providing basic protection. Norton 360 Deluxe is a comprehensive paid option with advanced features. Other free antivirus programs include Bitdefender Antivirus Free, Avast, Avira, and AVG, each with varying levels of effectiveness and features. Paid antivirus software typically offers better security, advanced features, and dedicated customer support, making it worthwhile for users needing more than basic protection. Free trials for paid antivirus solutions are often available for evaluation.