Activator.CreateInstance Works in Web Service ONLY if User is Logged in Locally

I have a WCF Service that impersonates a user and calls Activator.CreateInstance to create a COM Object:

if(impersonateValidUser(impersonatedUser,impersonatedUserDomain,impersonatedUserPassword))
    {
    try
    {
        obj = Activator.CreateInstance(Type.GetTypeFromProgID("Client.Application"));
    }
    catch { }
    undoImpersonation();
}

When I am logged on to the server locally as impersonatedUser, all works as expected. Client.exe exists as a process, as does Viewer.exe. Both are created when I activate the COM Object.

However, if I am NOT logged on locally as impersonatedUser, only Client.exe is created as a process, and I get the error:

The instruction at “<address>” referenced memory at "0x00000000". The memory could not be “read.”

My only guess is that the system doesn't allocate enoug开发者_StackOverflow中文版h memory if the user is not otherwise logged on? I have no other idea what the issue could possibly be. Any suggestions?

Thank you for any and all help!

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Is it possible that Viewer.exe is created after and somehow not allotted enough memory by your code? Could you activate that?