To keep a desktop computer secure on a company’s network, I would start by ensuring that the operating system and all software are up to date with the latest security patches. Next, I would install and configure a reliable antivirus program to protect against malware and other threats. It’s important to set up a firewall to monitor and control incoming and outgoing network traffic. I would also ensure that strong, unique passwords are used and changed regularly. Enabling encryption for sensitive data and implementing user access controls to limit permissions based on roles are also crucial steps. Additionally, I would conduct regular security audits and provide training to users on recognizing phishing attempts and other security risks.