Doom 3’s OpenGL renderer conflicts with Windows 10/11’s fullscreen optimizations. Fix:
Verify you have the latest DirectX End-User Runtimes and Visual C++ Redistributables installed. Step-by-Step Installation Guide doom 3 extract and play xedious fitgirl repack
If you have 8GB of RAM or less, check the "Limit installer to 2GB" box to prevent crashes. Doom 3’s OpenGL renderer conflicts with Windows 10/11’s