One of the most common Windows errors, along with the XINPUT1_3.dll, MSVCR110.dll, MSVCR100.dll, VCRUNTIME140.dll, and MSVCP140.dll errors is the D3DX9_39.dll error . The way the error is displayed is usually seen in the form of a pop-up window with a message that says “The program cannot be started because d3dx9_39.dll is missing from the computer. Try reinstalling the program to correct this problem ”or“ The program can't start because d3dx9_39.dll is missing ”when running a certain program or game, as in the case of League of Legends . The good news is that the error in question has an easy solution, and we will not have to resort to third-party programs for it.
How to install D3DX9_39.dll on Windows
The D3DX9393.dll error is usually related to the lack of some libraries that come from the Visual C ++ libraries for Visual Studio in Windows 7, 8 and 10 . Therefore, the only possible solution is based on reinstalling the libraries to solve the D3DX9_43.dll error.
- Download Visual C ++ for Windows
Before proceeding with the download we will have to check the type of system our computer is running, which can be a 32-bit or 64-bit based system. The process is as easy as right-clicking on the Windows icon on the Start bar and accessing the System option. In System type we can see the exact number of bits our system is running at.
Once we have made sure of the amount of bits supported by our computer, we will click on the download link and select one of the two files that the page shows: for 64-bit systems we will have to download the x64 file , while for 32-bit systems the file to download is x86 .
Finally we will install the program as if it were a common program and then we will restart the computer so that the changes are applied correctly .
Download D3DX9_39.dll manually for Windows 10, 8, and 7
If the above process has not worked, we will most likely have to manually add the file to the necessary folders.
- Download D3DX9_39.dll for 32-bit systems
- Download D3DX9_39.dll for 64-bit systems
When we have downloaded the file we will unzip it and paste it in all the folders of the programs that have shown the error in question. Accessing these folders is as simple as right-clicking on the program icon on the Windows Desktop and selecting Open file location .
To prevent the error from appearing again in other Windows programs, we will paste the same file in the System32 folder inside the Windows folder; specifically in the following path:
- C: \ Windows \ System32 \
Solution to D3DX9_39.dll error if the above does not work
If after following the steps that we have detailed in the article the problem persists, the only possible solution is to resort to a command accessible only through the Windows Command Prompt, which we can access by typing the word CMD in the search bar Windows by right clicking on the result to run the program with administrative privileges .
Then we will introduce the following command:
- sfc / scannow
Automatically a diagnostic tool will be run that, in addition to adding libraries necessary for the system, will repair all Windows files that show some type of error . Once the diagnosis is finished, we will restart the computer so that the changes are applied.