Install Microsoft Windows Server 2003 Service Pack 1 (SP1) to help secure your server and to better defend against hackers. Windows Server 2003 SP1 enhances security infrastructure by providing new security tools such as Security Configuration Wizard, which helps secure your server for role-based operations, improves defense-in-depth with Data Execution Protection, and provides a safe and secure first-boot scenario with Post-setup Security Update Wizard.You can download Windows Server 2003 SP1 here
Windows Server 2003 SP1 assists IT professionals in securing their server infrastructure and provides enhanced manageability and control for Windows Server 2003 users.
Microsoft launches Windows Server 2003 Service Pack 1

Microsoft has released Service Pack 1 for its Windows Server 2003 which is a collection of updates and security enhancements to improve the security and reliability of Windows Server 2003.