BCP command fails with ERROR:"User name not provided…", when both SQL Server 2000 and SQL Server 2005 Tools are installed on machine

This blog post has been moved to my team blog site >> https://blogs.msdn.com/sqlserverfaq/archive/2009/09/24/bcp-command-fails-with-error-user-name-not-provided-when-both-sql-server-2000-and-sql-server-2005-tools-are-installed-on-machine.aspx

Enjoy! And, thanks for reading.