D3dx9 43 dll is a system component for Windows operating systems responsible for processing in-game graphics. Generally, it comes with the DirectX distribution and is used by such titles as League of Legends, Guild Wars, World of Warcraft, World of Tanks, GTA, L.A. Noire and others.

General notes

Errors related to this file may arise for a wide range of reasons. For example, a faulty piece of software could have deleted or misplaced the dynamic link library. Alternatively, it might have been corrupted by malicious applications present on your personal computer or a damaged Windows registry.

Fix associated errors

If D3dx9 43 dll is missing from your system, you need to reinstall DirectX. It is recommended to delete the previous version as well as all traces left by the uninstallation. If that does not help, you can manually place the file into the system folder.

In order to do that, you have to know your OS architecture, which can be either 32 or 64 bit. Thus, the directory will be System32 or SysWOW64 respectively. After transferring the item to the appropriate location, it is recommended to reboot your PC in order to commit the modifications. If you want to improve in-game performance, you have the option of using special utilities like Smart Game Booster or AusLogics BoostSpeed.

Features

free to download and use;
compatible with modern Windows versions;
included in DirectX software distributions;
it is possible to manually redeploy the file;
available for both 32 and 64 bit systems.