Error with to create my dll component iis 6

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I have a ii6 on 2003 web server and i installed a my component maked in vb.net.
Before, on 2000 server,it didn't problem but since jenuary this component
gives me this error:
006~ASP 0177~Server.Cre ateObject Failed~8000ffff

If i use the component into an application (vb.net) this work without problem.

Thanks