Disable overlays one by one:
Rarely, bad sectors on an HDD or SSD can corrupt shader files. Install the game to a secondary drive (or USB 3.0 drive) to test. errgfxd3dshader1 work
Your GPU driver (NVIDIA, AMD, or Intel) acts as a translator between the game and the hardware. An outdated, beta, or corrupted driver may fail to interpret shader model 1 requests correctly. Disable overlays one by one: Rarely, bad sectors