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Windows XP Service Pack 1a

Windows XP Service Pack 1a (SP1a) provides the latest security and reliability updates to the Windows XP family of operating systems, and includes Internet Explorer 6 SP1a. Windows XP SP1a is designed to ensure Windows XP platform compatibility with newly released software and hardware, and includes updates that resolve issues discovered by customers or by Microsoft's internal testing team. To determine whether to install Windows XP SP1a, we recommend reviewing the Windows XP documentation and information below. If you have already installed Windows XP SP1, you do not need to install Windows XP SP1a.

For further information about the specific difference between Service Pack 1 and Service Pack 1a (SP1a) for Windows XP, see article 813926, Differences Between Windows XP SP1 and Windows XP SP1a.
 

http://www.microsoft.com/windows2000/downloads/servicepacks/sp4/default.asp

Windows 2000 Service Pack 4 (SP4) provides the latest updates to the Windows 2000 operating systems. These updates are a collection of fixes in the following areas: security, application compatibility, operating system reliability, and setup. Windows 2000 SP4 is a recommended update that includes the updates contained in previous Windows 2000 service packs.

http://www.microsoft.com/windows2000/downloads/servicepacks/sp3/default.asp

Windows 2000 Service Pack 3 (SP3) provides updates to the Windows 2000 family of operating systems. These updates are a collection of fixes in the following areas: application compatibility, operating system reliability, security, and setup. Windows 2000 SP3 includes the updates contained in Windows 2000 Service Pack 1 (SP1), Windows 2000 Service Pack 2 (SP2) and Windows 2000 Security Rollup Package 1. Windows 2000 SP3 is a recommended upgrade. Windows 2000 SP3 includes Windows Installer 2.0 please see the Deployment Guide for more information. To determine whether to install Windows 2000 SP3, Microsoft recommends that customers review the Windows 2000 SP3 documentation found under Learn More.