Malware can sometimes delete or corrupt essential system files like d3dx9_43.dll . Before proceeding, use your trusted antivirus or Windows Security (formerly Windows Defender) to perform a full system scan to eliminate this possibility.
The safest, cleanest, and most effective way to fix this issue is to install the official legacy runtime libraries from Microsoft. This restores all missing DirectX 9, 10, and 11 files simultaneously. Step-by-Step Installation: how to fix d3dx943dll missing pes 2017 work
You can source a safe copy of the file from a reliable archive platform like DLL-files.com . Once downloaded: Malware can sometimes delete or corrupt essential system