This is the most common reason for Error 4. Windows Defender or a third-party antivirus sees the TeknoParrot loader (which injects DLLs into memory) as a potential threat (false positive) and blocks the memory injection.
If you are trying to launch an arcade game via TeknoParrot (specifically titles like House of the Dead 4, House of the Dead: Scarlet Dawn, or other Lindbergh/RingEdge games) and you are hit with the dreaded "Failed to load DLL: Error 4" message, don't panic.
This error is almost always related to missing Visual C++ Redistributables or DirectX libraries that the game needs to run but are not present on your modern Windows PC.
Here is the step-by-step solution to fix Error 4.
Missing DirectX/graphics libraries
Blocked or quarantined DLLs (Windows marks files downloaded from the internet)
32-bit vs 64-bit mismatch
Corrupt TeknoParrot or game installation
Dependency issues (missing other DLLs)
Path or working-directory problems
GPU overlay/hooks causing conflicts
Permission/UEFI/Driver signature enforcement
Sometimes, the error is literal: the DLL file the loader is looking for is not in the game folder. teknoparrot failed to load dll error 4 hot
d3d9.dll from C:\Windows\System32 and paste it into the game folder, though this is not always recommended for all games).Arcade loaders (TeknoParrot) and the DLLs they inject often trigger false positives in Windows Defender or third-party antivirus software. If the antivirus deletes or quarantines a DLL right as you try to launch, you will get Error 4.
Navigate to C:\Windows\System32 in an admin command prompt and run:
regsvr32 MSVCP140.dll
regsvr32 VCRUNTIME140.dll
If these fail to register, your Visual C++ install is broken. Uninstall all Visual C++ Redistributables via Apps & Features, then reinstall the all-in-one pack from TechPowerUp (search "Visual C++ Redistributable Runtimes All-in-One").