修改注册表通过自动更新安装Vista SP2 RC

本月四号，在发放给了MSDN和TechNet的订阅者之后，微软正式向公众发布了Vista/Server 2008 SP2 RC。

Vista SP2 RC提供了.exe和独立ISO镜像两种格式，但其实，用户还可以自动更新来更新，和当初SP1时一样，修改一个注册表键值即可实现，微软为此还特地提供了一个工具。在安装SP2 RC前，用户必须首先安装有SP1，如果安装有SP2 Beta，必须先卸载。

想要通过自动更新来更新SP2 RC的用户只需下载下面的文件后，右键-以管理员身份运行即可。

附部分原文：

On March 3, Windows Vista Service Pack 2 and Windows Server 2008 SP2 went live on the Microsoft Download Center. A day later, Microsoft was confirming officially that the second service pack for Vista and Windows Server 2008 had indeed been made available to the public, after the bits were initially released to MSDN and TechNet subscribers the past week.
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