Resolve “Login failed for user ''. The user is not associated with a trusted SQL Server connection.” in IIS within Windows XP

I'm getting the following error in my ASP.NET web application in IIS when running in Windows XP. I'm using Windows Authentication within the web application. I would normally use SQL Server Authentication (with mixed mode), but I do not have access to this database server, except read permissions. They only allow Trusted Connections (or Integrated Security=SSPI;) meaning using our Windows network authentication user.I'm getting the following error in my ASP.NET w