How can I protect my network from hackers?

1. Regularly patch your operating system and web browsers.
2. Install anti-malware software and keep it up-to-date.
3. Define a policy for creating, changing, and protecting passwords.
4. Develop, implement, and document a secure operating system configuration.
5. Install and configure a firewall on systems with Internet access.
6. Ensure strict compliance with the corporate security policy.