Here are a couple more items to check while trying to get your connectivity
to the remote SQL Express installation working...
By default SQL Server 2005 Express SKU will install with network protocols
disabled. If you want to use a tool external to your SQL Express
installation box to connect to it, then you need to enable the network
protocols. In the "SQL Server 2005" program folder from the start menu, you
should be able to find a "Configuration Tools" folder. In this folder launch
the "SQL Server Surface Area Configuration" tool. After connecting to the
SQL Express instance in the tool, look under "Database Services" and
configure the "Remote Connections option.
Another item to note is that by default in SQL Server 2005 Express SKU, the
default instance is SQLEXPRESS, not MSSQLSERVER. When you try to connect
remotely, you need to use the server name and instance name, i.e.
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