There was an error (0x84B100) when generating an XML document in SqlServer2008.

Based on the error code provided, 0x84B100 is an error code for SQL Server 2008 installation, indicating that the setup program encountered an error while generating an XML document.

You can try the following steps to resolve the issue with this error code:

1. Make sure your computer meets the system requirements for SQL Server 2008. This includes checking the operating system version, hardware requirements, and so on.
2. Try reinstalling SQL Server 2008. Before reinstalling, make sure to completely uninstall any previous installations of SQL Server 2008. This can be done by using the “Programs and Features” option in the Control Panel.
3. When installing SQL Server 2008, try disabling the firewall and antivirus software. These security software can sometimes interfere with the installation process.
4. If the above steps do not resolve the issue, you can try using the installation log files of SQL Server 2008 to further investigate errors. These log files are located in the “Log” folder within the installation directory.

If the issue persists, you can try searching for similar issues reported by other users, or contact Microsoft Support for assistance.