>Just a SWAG, but in the Data Source isn't the ".\" syntax referring to the local machine? Is the SQL server you're trying to attach to on the local machine, or a remote one? If remote you might need something like

Data Source=\\MachineName\InstanceName

It is local.

I also tried:

lcSQLString=[Driver={SQL Server};Server=./SQLEXPRESS;Database=test;Trusted_Connection=yes;]
lcSQLString=[Driver=SQL Server;Server=./SQLEXPRESS;Database=test;Trusted_Connection=yes;]
lcSQLString=[Driver={SQL Server};Server=./SQLEXPRESS;Database=test;Integrated Security=SSPI;User Instance=yes;]
lcSQLString=[Driver=SQL Server;Server=./SQLEXPRESS;Database=test;Integrated Security=SSPI;User Instance=yes;]

I always get SQL Server does not exist or access denied.