I doesn't look like any dependencies are missing.
WAG, I would try

= oDocs.SetRoot('C:\' + CHR(0))

BTW, does it expect ANSI or Unicode string as parameter?

>
>I have use dependency walker like you suggest me and this message appear in the bottom
>
>Warning: At least one delay-load dependency module was not found. it was the DWMAPI.DLL
>
>I add this dll in my computer and after that i only get this message
>
>Warning: At least one module has an unresolved import due to a missing export function in a delay-load dependent module.
>
>But the Com i try to use dosent work.
>
>I have use regsvr32 to register the com.
>
>If i can see it in the objectbrowser i suppose it's ok.
>
>Do i need to do something else
>
>TIA