Your video card might be the problem. It's from early 2011 and AMD's latest driver for it is from 2016. Also, fans generally don't last 8 years and it might be dead causing the gpu to overheat. I'd have a look inside your computer and see if it needs cleaning, and make sure all your fans still work. You can check system temperatures with an app like hwinfo or hwmonitor.
At any rate, assuming it works, it'd probably only be able to hand quarter size textures, so try that, and also try eighth size and see what happens.
I think at the least though you need a new video card.