Failed Login for a WorkGroup when attempting to run a query

Hi all,
I have an application which works with SQL Server. When the applicationattempts to load a page it needs to run certain queries. When itattempts to run a particular query it fails but I catch the exceptionand then log it. The following is logged:
System.Data.Ole.Db.OleDbException: Login failed for user 'CWAMB01DWH01\ASPENT'.
Now what I don't understand is that this is the work group that ASPNETis run under, and I am running other queries to the database via SQLServer authentication. Why am I getting a failed login for thisworkgroup? Do I need to create a new Login for the Server in SQLServer, and then create a new user for the database with the sameusername as the Workgroup name? If so, then how does the password workfor the SQL Server as the workgroup (CWAMB01DWH01\ASPENT) obviouslydoesn't have a password.
Thanks, and I hope I have explain my problem clear enough.
Tryst
There are two permissions in SQL Server database permissions in the database and server permissions you create under security in Enterprise Manager. Hope this helps.