JSI Tip 8658. You cannot start your computer after you modify the permissions in Windows Server 2003, in Windows XP, or in Windows 2000?

Microsoft Knowledge Base Article 883275 contains the following summary:

This article describes error messages that you may receive after you modify some security permissions on your computer that is running Microsoft Windows Server 2003, Windows XP, or Windows 2000. This article discusses how to resolve these issues on each operating system. It also discusses how to resolve a paging file issue that you may experience after you resolve the security permissions issue.