How to solve the error code 0x84B20001: SQL Server 2012 Setup Failure

There are several possible solutions to the error code 0x84B20001 when installing SQL Server 2012:

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