Your computer is that old. That processor dates to Q2 2010.
The integrated graphics are that old as well. Using a driver from 2012 for the intel and 2015 for the AMD.
My hunch is that what you’re seeing is the dual gpu issue with old AMD graphics that means you’d need to launch in windowed for classic.
However, you do need to realize that your system is below minimum specs for BFA, and due to the age of the system, there may not be much anyone here can do to help troubleshoot it.