Thought I'd show folk the latest from Microsoft Solutions for Security:

The Windows XP Security Guide v2.0

The Windows XP Security Guide v2.0 covers the procedures involved in creating a safe computing environment. This includes recommended security settings for Internet Explorer in areas such as add-on management, MIME handling, zone elevation protection, and restricting ActiveX installation. Settings for System/Internet Communication Management and Windows Firewall are also provided.
The Windows XP Security Guide v2.0 is available on the Microsoft Security Guidance Center at: Guide - Securing Windows XP: http://www.microsoft.com/technet/security/prodtech/windowsxp/secwinxp/default.mspx

The Guide is also available on the Microsoft Download Center at http://www.microsoft.com/downloads/details.aspx?FamilyId=2D3E25BC-F434-4CC6-A5A7-09A8A229F118&displaylang=en

The Antivirus Defense-in-Depth Guide

The Antivirus Defense-in-Depth Guide provides an easy to understand overview of different types of malware, or malicious software, including information about the risks they pose, malware characteristics, means of replication, and payloads. The guide details considerations for planning and implementing a comprehensive antivirus defense for your organization, and provides information on defense-in-depth planning and related tools that you can use to help reduce your risk of infection.
The Antivirus Defense-in-Depth Guide is available on the Microsoft TechNet Security Center at: Guide - Antivirus Defense-in-Depth: http://go.microsoft.com/fwlink/?linkid=28732

The Guide is also available on the Microsoft Download Center at http://www.microsoft.com/downloads/details.aspx?FamilyId=F24A8CE3-63A4-45A1-97B6-3FEF52F63ABB&displaylang=en

The Microsoft Windows NT 4.0 and Windows 98 Threat Mitigation Guide

This guide identifies security issues in networks that include computers running the Microsoft® Windows NT® 4.0 and Windows® 98 operating systems, and explains the best hardening strategies that an organization can use until they are able to upgrade these operating systems. 
The Microsoft Windows NT 4.0 and Windows 98 Threat Mitigation Guide is available on the Microsoft Security Guidance Center at:
Windows NT:  http://go.microsoft.com/fwlink/?linkid=32048

The Guide is also available on the Microsoft Download Center at
http://www.microsoft.com/downloads/details.aspx?FamilyId=25A7A093-496B-4F02-9708-076B8322A5B9&displaylang=en