Install Fails with error message "The instance name specified is invalid"
This error message is displayed when SQL Server is already installed (either SQL Server 2000 or MSDE), or if it was installed at one time and was not properly or fully uninstalled. Some applications, like ours, install MSDE without any user intervention, making it difficult to know that it has been installed.
Look for the directory \Program Files\Microsoft SQL Server. If it exists, then SQL Server 2000 or MSDE is installed.
If SQL Server 2000 or MSDE are installed, you will need to download and install WebWatchBot for SQL Server.