.net pet shop problem

[James]

hi!
i have install petshop 3.0 sucessfully
but when i run it ,the follow error message occurs

---[SqlException: Login failed for user 'mspetshop'.
Reason: Not associated with a trusted SQL Server
connection.]
System.Data.SqlClient.ConnectionPool.GetConnection
(Boolean& isInTransaction) +484

System.Data.SqlClient.SqlConnectionPoolManager.GetPooledCo
nnection(SqlConnectionString options, Boolean&
isInTransaction) +370
System.Data.SqlClient.SqlConnection.Open() +384
PetShop.SQLServerDAL.SQLHelper.PrepareCommand
(SqlCommand cmd, SqlConnection conn, SqlTransaction
trans, CommandType cmdType, String cmdText, SqlParameter
[] cmdParms) +40
PetShop.SQLServerDAL.SQLHelper.ExecuteReader(String
connString, CommandType cmdType, String cmdText,
SqlParameter[] cmdParms) +140
PetShop.SQLServerDAL.Account.SignIn(String userId,
String password) +114
PetShop.BLL.Account.SignIn(String userId, String
password) +148
PetShop.Web.ProcessFlow.AccountController.ProcessLogin
(String userId, String password) +37
PetShop.Web.SignIn.SubmitClicked(Object sender,
ImageClickEventArgs e) +122
System.Web.UI.WebControls.ImageButton.OnClick
(ImageClickEventArgs e) +109

System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostB
ackEventHandler.RaisePostBackEvent(String eventArgument)
+69
System.Web.UI.Page.RaisePostBackEvent
(IPostBackEventHandler sourceControl, String
eventArgument) +18
System.Web.UI.Page.RaisePostBackEvent
(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain() +1277
---------
my system is : winxp ' mssql 2000 ' vs.net 2003
i'm sure i install it sucessfully

if i forget something to configure ms sql?
please give me some idea, thanks~