Counter Strike Source Runtime Error 5 At 00403fa4 ((exclusive)) Jun 2026

Data Execution Prevention (DEP) is a security feature that marks certain memory regions (like 00403fa4 ) as "non-executable." We need to add hl2.exe to the DEP exception list.

At hl2.exe + 0x3fa4 , the code typically contains a call to a validation function for game resources. Specifically, this region handles: Counter strike source runtime error 5 at 00403fa4

| Cause | Description | Frequency | |-------|-------------|------------| | | Windows 8+ introduced DX9Ex, which changes how IDirect3D9::CreateDevice handles certain parameters. CSS’s old DX9 implementation may call this with invalid arguments. | High | | Corrupted video.txt | The configuration file at css/cfg/video.txt may contain resolution or refresh rate values unsupported by the monitor/driver (e.g., 0x0, 9999 Hz). | High | | Third-party injectors | Old versions of HUD mods, ESP hacks, or SweetFX injectors attempt to hook 00403fa4 or use LoadLibrary improperly, leading to argument errors. | Medium | | Steam Cloud desync | Steam Cloud restores a corrupted clientregistry.blob or steam.inf from a previous incompatible version. | Low | Data Execution Prevention (DEP) is a security feature

Unlike a compile-time error (where code fails to build), a runtime error occurs while the program is executing. The computer successfully launched hl2.exe , but then hit a logical wall. CSS’s old DX9 implementation may call this with