Accessing interop service

[russellmunday]

Hi this is the first application i have written so i am very new to the whole webserver bit.
the application works for the most part but gives the following error when the application calls excel.

Server Error in '/' Application.
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Login failed for user 'WEBORDER\IWAM_WEBSVR1'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Runtime.InteropServices.COMException: Login failed for user 'WEBORDER\IWAM_WEBSVR1'.

Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[COMException (0x80040e4d): Login failed for user 'WEBORDER\IWAM_WEBSVR1'.]
ADODB.ConnectionClass.Open(String ConnectionString, String UserID, String Password, Int32 Options) +0
gratte.confirm.xls() +72
gratte.confirm.ordercmd_Click(Object sender, EventArgs e) +127
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain() +1277

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Version Information: Microsoft .NET Framework Version:1.1.4322.573; ASP.NET Version:1.1.4322.573
I have tried to configure dcom but i seem to get this error no matter what.
where am i going wrong?