Antivirus software has been a common tool for PC users over the past two decades, with many opting for third-party solutions for enhanced protection despite Windows 11's built-in features. User behavior significantly impacts computer security, emphasizing the importance of avoiding unknown links and not reusing passwords. Antivirus packages are designed to combat threats like ransomware, spyware, and viruses. The evaluation process for antivirus applications involved testing on a Windows 11 PC with simulated virus attacks and scanning the SSD for performance metrics. The top antivirus apps for 2025 include BitDefender Total Security (£49.99), Avira Free (free), Malwarebytes Plus (£49.99), and Sophos Home Premium (£37.46).