Are you 100% sure that the new environment is really Express?
If so, you may need to configure the server to connect user instances. If you have administrator access, you can run this command.
-- Enable user instances.
sp_configure 'user instances enabled','1'
-- Disable user instances.
sp_configure 'user instances enabled','0'
http://msdn.microsoft.com/en-us/library/ms254504.aspx
, SQL Server ( -) " " (.. / ) . SQL Server Express.