Transferring DB From SQL Express To SQL Server 2005

Hi,
I have an asp.net (C#) project running perfectly on 2 machines running SQL Express.
I need to transfer it to a machine running SQL Server 2005 (I don't believe it has SQL Express installed).
I've setup the database on the new machine by right clicking 'Data Connections', Selecting my machine as the server name and attaching the database file from the other machine in the App_Data folder. My connection string is as follows:
    Data Source=My Machine Name;AttachDbFilename=|DataDirectory|ASPNETDB.MDF;Initial Catalog=ASPNETDB.mdf;Integrated Security=True 
It compiles fine, but when I try to access the profile object from C# (e.g. Profile.County), it fails with the following error:
    "An error has occurred while establishing a connection to the server.
 When connecting to SQL Server 2005, this failure may be caused by the fact that
under the default settings SQL Server does not allow remote connections.
(provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance
Specified)"Line 19: public virtual string County {
Line 20: get {
Line 21: return ((string)(this.GetPropertyValue("County")));
Line 22: }
Line 23: set { 
N.B: This only seems to occur when I try to access Profile properties. I can access and update the tables I've created just fine, and I can access the user details tables created by Visual Studio just fine too (e.g. aspnet_Users).
I understand the profile properties are stored in the database, am I missing a setting somewhere?
Hope you can help.
James Dimmock