Application is visible when started through Automation

[Jaco]

Hallo,

I want to call AutoCad from my VB program.

Set acadApp = CreateObject("AutoCAD.Application")

Everything works fine when I call it from an NT user account, but when I start my program from an admin account then AutoCad is opened as visible which I can't accept.
Any ideas? Where can I set the behaviour of the OLE Automation server? I want to run my program as NT service (with help of the servany.exe) so there can't be any iteraction with the user interface (not even for a second)

Thanks for any help.

Jacek