You must have Windows XP SP2 installed before you apply this update.

意思是说，你要先安装sp2，才能安装这个更新。

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If this issue has already occurred, uninstall this release candidate, install Windows XP SP2, and then reinstall the release candidate.

如果这个问题已经发生，卸载这个候选版本，安装Windows XP SP2，然后再重新发布的候选版本。

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Microsoft has made new security and privacy enhancements in Windows XP SP2 to help better safeguard computers from hackers, viruses, and other online threats.

Microsoft在Windows XP SP2中提供了一些新的安全性和保密性增强功能，从而更好地保护计算机免受黑客、病毒以及其他联机威胁的攻击。

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The iTunes vulnerabilities were spotted by Kaspersky on the Mac OSX v10.5 and later, Windows 7, Vista, and Windows XP SP2.

FORBES: Apple's iTunes, QuickTime, High On Cyber Security Vulnerability List, Kasperky Lab Says

According to the Microsoft Web site, the operating systems affected include Windows XP, Windows XP Service Pack 1, Windows 2000 SP2, Windows 2000 SP3 and Windows 2000 SP4.

CNN: Sasser worm rips through Internet