Our problem is, is that we will not / cannot support hardware indefinitely.
So if you PC chipset is 14 years old, which is prehistoric metaphorically in computer terms, support will stop at some point.
You could try one of the earlier OpenELEC releases, but don't expect miracles.
Why not get yourself a simple Raspberry Pi 3B+ or B setup, it will quietly dance circles around your old PC
will Rpi zero w work with LibreELEC?