As Sixfour said in a previous post, I am also having the Illegal Memory Access error. Mine occurs when I go to sell my backpack full of items to a shop.
This has happened in multiple shops, 1N Drune, 1N Wen to name a couple.
I am running the game in Win XP SP3 compat mode, along with DISABLETHEMES DISABLEDWM, and Admin mode.
Intel i7-8750H 2.2G processor