Hi Borislav,
>I try to create an instance to a COM server registered on a different computer (not at mine).
Does your current user account have all required permissions on the Windows 2003 server. That is, is there an account with the same name and password, does the account have network logon permissions, does the account ahve launch and access permissions in Component Services? Are you sure that there's no firewall blocking COM calls?
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Christof