Backup SharePoint 2007 Problem

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Backup SharePoint 2007 Problem

I am using SharePoint 2007 API (C#) to do backup. When I use the API in user mode process, it can obtain the right topology of entire Farm every time. When I use them in a COM+ component (written by C#), it will get the right topology for the first and second time, the third time will return the wrong topology, the administrative web site should under SSP node but they are under normal web site node and SSP children has nothing.

Could some one please give me some help