You may have to restart the computer when you install the security update that Microsoft Knowledge Base article 933579 describes

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INTRODUCTION

Microsoft has released a security update for Microsoft XML Core Services 6.0 (MSXML 6.0). When you install the update, you may have to restart your computer.

All System Center Operations Manager 2007 server components and agents require MSXML 6.0. If MSXML 6.0 is not already included in the operating system, the service is installed on servers and client computers as part of the System Center Operations Manager 2007 installation.

For more information about the security update for Microsoft XML Core Services 6.0, click the following article number to view the article in the Microsoft Knowledge Base:

933579 (http://support.microsoft.com/kb/933579/ ) MS07-042: Description of the security update for Microsoft XML Core Services 6.0: August 14, 2007