Desperatly Need Help With MSDE Installation And Config

Hi all, I know read all the posts already up on this subject... Hear me out.

Can anyone give an easy to understand, and I mean easy method for installing MSDE and configuring it so that I can connect to my server using Visual Studio.NET C#. I am having no end of troubles and I don't really understand why. I can log into osql using

osql -S BIGJ -E

that gets me to

1>

No problems so far

but when I try to connect using

SqlConnection("Server=BIGJ;DataBase=registeredUsers;Integrated Security=SSPI");

I am having no luck and I don't really understand why

Here is the stack trace

[SqlException: Login failed for user 'BIGJASPNET'.]   System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction)   System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction)   System.Data.SqlClient.SqlConnection.Open()   ADOAccess.WebForm1.Button1_Click(Object sender, EventArgs e) in c:inetpubwwwrootadoaccesswebform1.aspx.cs:52   System.Web.UI.WebControls.Button.OnClick(EventArgs e)   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)   System.Web.UI.Page.ProcessRequestMain()

I think I am not understanding the fundamentals of SQL server or something so if anyone can help or point me to a good tutorial that will help me not only solve my problem but also understand what is going onas well.

Thanks everyone