d3dx9_33.dll is related to some functions and resources that allow your applications or PC games to run properly. If d3dx9_33.dll is missing or corrupt due to various reasons, you may encounter errors. When a .dll error occurs, you are usually notified via a pop-up error message that will inform you what kind of .dll error you have.
Other possible d3dx9_33.dll errors:
To fix the d3dx9_33.dll or other .dll files related errors automatically, download the DllKit, the .dll repair tool, and perform a scan for invalid or missing .dll files. DllKit will also check whether other .dll files are registered in your system and search for other issues that may be preventing your system from working properly. After the scan process is complete, DllKit will help you to get the errors fixed.