Service Pack 1 (SP1) provides the latest updates to the Windows 2000 family of operating systems. These updates are a collection of fixes in the following areas: setup, application compatibility, operating system reliability, and security. SP1 is not considered a required upgrade; Microsoft recommends that customers review the SP1 documentation to determine whether to install SP1.

There are two ways to obtain SP1. You can order the Windows 2000 SP1 CD or download SP1 directly from this Web site.

Order Service Pack 1 on CD
The Windows 2000 SP1 CD includes the same software as the Web download, as well as additional components and support tools for system administrators and other advanced users. Customers in the United States and Canada can order the CD from this Web site. Other international customers can obtain the CD through their local Microsoft subsidiary

Download Windows 2000 SP1
Installing this Service Pack does not change your current encryption level. Setup determines the encryption level of your operating system, either standard (56-bit) or high (128-bit) encryption, and automatically installs SP1 with the same encryption level. After SP1 is installed, if you want to change your encryption level from 56-bit to 128-bit, install the Windows 2000 High Encryption Pack. (If you decide to install the Encryption Pack before installing SP1, be sure to restart your computer before installing SP1.)

Learn More

• System Requirements
  Check the system requirements for SP1.
• Readme File
  See the Readme file for documentation about SP1, including installation instructions and pointers to related information.
• Release Notes Article
  See the Microsoft Knowledge Base (KB) Article for the most up-to-date information on SP1 release notes and known issues.
• Updates Catalog
  View the list of updates included in SP1.
• SP1 Installation and Deployment Guide
  The Windows 2000 Service Pack Installation and Deployment Guide has been prepared for corporate system administrators to provide necessary guidelines and instructions for installing the Service Pack, including: technical details, procedures, and recommendations for successfully installing the Service Pack on multiple computers in a small business or corporate environment. This guide assumes a working knowledge of Windows 2000 and Service Pack installations.
• Frequently Asked Questions (FAQ)
  Get answers to questions about SP1.
• Security Updates
  Visit Microsoft's Security Advisor Web site for the latest security bulletins.
• Market Bulletin
  Read the market bulletin for SP1.
• SP1 Customer Support Diagnostics Update
  Recommended for system administrators and other advanced users. The Windows 2000 SP1 Customer Support Diagnostics Update is included on the SP1 CD, but is not part of the SP1 Web download.
  The SP1 Customer Support Diagnostics Update provides the updated symbols for diagnosing Windows 2000 system problems. The Customer Support Diagnostics Update is not required for proper operation of your computer.
• SP1 Checked Build Files
  Recommended for system administrators and other advanced users. The Windows 2000 SP1 Checked Build is a separate version of SP1 and should not be installed in addition to the SP1 Web download or the SP1 CD.
  The Checked Build is a compiled set of files that include debugging information, providing administrators with specific details about program functioning. The Checked Build files are not required for proper operation of your computer.
• Terminal Services Advanced Client
  The Terminal Services Advanced Client (TSAC) is available on the Windows 2000 SP1 CD in the 'valueadd' directory, and is not a component of SP1 itself. As such, the TSAC is not included in the SP1 Web download, but it can be downloaded separately from the TSAC download page. The TSAC is a Win32®-based ActiveX® control (COM object) that can be used to run Terminal Services sessions within Microsoft Internet Explorer.