connecting to sql server

[Druss]

i setup a new computer and installed all necessary programs.
i copied my asp.net project to new machine.but i doesnt run.
it gives an error in default.aspx file.
SQL Server does not exist or access denied.
i added ASPNET user to sql server. nothing changed

in web.config file;
<add key="ConnString" value="server=localhost;Trusted_Connection=true;database=DUNN" />

where did i make mistake.

Not: old machine runs Win2000 pro
new machine runs WXP Pro.

thanx all

[diegojancic]

Try logging on with the sa Account.... or Impersonating??