You can find these on Intel’s legacy support page or Dell’s support repository for G31 controllers.
Most G31 boards use basic Microsoft Display Adapters as official support for the G31 ended before Windows 10. Koloe / Dianji ZX-G31LM - The Retro Web zx-g31lm motherboard driver
Intel® G31 Express (GMCH) paired with the ICH7 Southbridge. You can find these on Intel’s legacy support
Integrated Intel Graphics Media Accelerator (GMA) 3100 . zx-g31lm motherboard driver