How to solve the error code 0x84B40000: SQL Server 2012 Setup Failure

There are several possible solutions to the error code 0x84B40000 when installing SQL Server 2012. Here are some steps you can try:

1. Check system requirements: Make sure your system meets the minimum requirements for SQL Server 2012. Check the hardware and software requirements, including the operating system version, processor, memory, and disk space.
2. Disable antivirus software: Antivirus software can interfere with the installation process. Disable your antivirus software temporarily and try the installation again.
3. Run the installation as an administrator: Right-click on the setup file and select "Run as administrator" to ensure that you have the necessary permissions to install SQL Server.
4. Check the installation media: If you are installing from a DVD or USB drive, make sure it is not damaged or corrupted. Try copying the installation files to a different location and run the setup from there.
5. Check the installation log files: The installation log files can provide more information about the error. Check the log files located in the %ProgramFiles%\Microsoft SQL Server\110\Setup Bootstrap\Log folder for any error messages.
6. Uninstall previous versions of SQL Server: If you have any previous versions of SQL Server installed, uninstall them before installing SQL Server 2012.
7. Install the latest service pack: Make sure you have the latest service pack installed for your operating system. You can download the latest service pack from the Microsoft website.