Whereas (XP) SP1 focused on remedying antitrust violations with bundled Windows utilities, almost all of SP2 is devoted to beefing up Internet security. SP2 doesn’t thoroughly shield you from attacks, but it’s definitely worth installing for its firewall improvements, Internet Explorer pop-up blocking, and security-configuration changes. Once you’ve installed it, you’ll probably want to tweak some of SP2’s new settings, and to know where–tweaked or not–the reinforced OS remains vulnerable.
Fine-tune the settings in Microsoft’s recently released Windows XP Service Pack 2.