How to Fix DirectX and Visual C++ Errors When a Game Will Not Launch
Missing d3dx9_43.dll, VCRUNTIME140.dll not found, 0xc000007b: these launch errors have three usual causes and a clear order of fixes.
Games are compiled against exact versions of shared runtime libraries. Windows ships some of them, never all of them, and older titles expect libraries Microsoft retired years ago. So a game can fail to start on a perfectly healthy PC simply because one redistributable is missing. The error text usually tells you which family you are dealing with.
Read the error before fixing it
- Names ending in .dll plus phrases like "was not found" or "is missing" point to a runtime that is not installed.
- 0xc000007b means a 32-bit and 64-bit mismatch between the game and a library it loaded.
- DirectX-specific messages about d3dx9, d3dx11 or xinput come from the legacy DirectX redistributable.
- Errors about DOTNET or clr point at the .NET Desktop Runtime instead.
Install the runtime set in order
- Install the Visual C++ Redistributable packages from Microsoft's official pages, both x86 and x64, and cover the older yearly versions as well as the current ones. Old games link specifically to 2008, 2010, 2013 and 2015-2022 libraries.
- Run the DirectX End-User Runtime installer once. It adds the D3D9, D3DX and XAudio components that modern Windows no longer includes by default.
- Install the .NET Desktop Runtime if the error mentions .NET or clr.
- Reboot, then launch the game before changing anything else.
Never download a single DLL from the internet
DLL download sites are a classic malware channel. Dropping an unsigned vcruntime140.dll into a game folder can silence the error and infect the machine at the same time. Installing the official redistributable achieves the same result with a trusted file and a proper installer, and the game will keep working after the next update.
Check the prerequisites folder in the game install
Many installers ship a Redist or Prerequisites folder containing the exact runtime versions the game was built against, often in separate 32-bit and 64-bit subfolders. Running those installers is the most precise fix available, because it matches the build rather than guessing.
If the runtimes are already installed
- Check your antivirus quarantine: runtime DLLs occasionally get flagged and silently removed.
- Run the game once as administrator to rule out a permissions problem on its folder.
- Update the GPU driver, then roll back to the previous version if the game started failing right after an update.
- Repair the Windows component store with a system file scan and a deployment image restore if several applications fail at once.
Runtimes first, drivers second, system file repair third, and no manual DLL copying at any point. That sequence resolves the large majority of launch failures that are not caused by missing game files.