A few things I can see
Your hardware is definitely very outdated so that’s going to be a part of the problem, your GPU while it’s 10 years old it was higher end when it came out and it should be able to run the editor. However, it does not support DX12 so you shouldn’t be trying to run it under DX12, just run it under the default DX11. DirectX support is built in to the GPU so if it wasn’t released with DX12 support then it won’t ever support it.
Also as far as your GPU goes, you’ve got two cards there, I would remove one unless you have other software you want to continue using that takes advantage of both, UE4 does not support multiple AMD GPU’s and if you’ve got some AMD setting enabled for the multiple GPU’s it is likely causing problems with UE4.
Your CPU is very slow at this point. I don’t know if that is the main issue but it’s at least a problem.