HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Windows\RequireSignedAppInit HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows\RequireSignedAppInit Set the following registry entries to 0 to allow unsigned AppInitDLLs to enable Nvidia Optimus to function as expected: More information about AppInit_DLLs and other associated registry keys, see this Microsoft article: AppInit_DLLs in Windows 7 and Windows Server 2008 R2 This is stupid since some anti-malware utility or security software (my bet is on something like Combofix) may modify a specific registry entry on Windows 7 to prevent unsigned app init dlls from running. Shockingly, the dlls that Nvidia uses to intercept calls for the GPU so that the Nvidia graphics accelerator can be used rather than the Intel Integrated Graphics device may not be signed. The solution is not to add the program to Nvidia Control Panel, nor to update your graphics driver, nor to disable your Intel integrated graphics. For more information about installing the latest graphics driver on your system, see How to Install an Intel® Graphics Driver in Windows® 10.Are you, like many others ( Steam forum full of non solutions) getting this error message even though your laptop has a DirectX 11 capable graphics chip? Are the resident know-it-all’s giving you trouble claiming your Nvidia GTX 555m isn’t DirectX 11 capable, isn’t compatible, or isn’t powerful enough to run the game? We recommend that you update to the latest Intel Graphics driver to get full API support. Intel Graphics supports a wide range of APIs. PC games and applications often require a graphics card that is compatible with specific Application Programming Interfaces (APIs), such as OpenGL*, DirectX*, OpenCL*, or Vulkan*.
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