System error "the program can't start because d3dx9_43.dll is missing from your computer

Hi Rabi,

Thank you posting your query on Microsoft Community.

To assist you better, provide us the following information:

1. Have you made any changes to the Computer prior to the issue?
2. Are you getting any error message?

Refer to the below steps to resolve the issue.

Step 1: I would suggest you to boot into clean boot state and try to install the program.

Refer to the below Microsoft Help Article to boot the Computer in clean boot state.

https://support.microsoft.com/kb/929135

Clean boot disclaimer: A clean boot is performed to start Windows by using a minimal set of drivers and startup programs. This helps eliminate software conflicts that occur when you install a program or an update or when you run a program in Windows. You may also troubleshoot or determine what conflict is causing the problem by performing a clean boot. You must log on to the computer as an administrator to be able to perform a clean boot. Your computer may temporarily lose some functionality when you perform a clean boot. When you start the computer normally, the functionality returns. However, you may receive the original error message, or experience the original behavior if the problem still exists. If the computer is connected to a network, network policy settings may prevent you from following these steps.

Once you perform clean boot do refer to the section “How to reset the computer to start normally after clean boot troubleshooting” to boot the computer in normal mode.

Step 2: If you are still not able to install. Then can also try to install the program in compatibility mode for Windows 7.

http://windows.microsoft.com/en-us/windows/make-older-programs-run#1TC=windows-7

Reply to us with the information, so that we can resolve the issue.

For any Windows related assistance in the future, feel free to contact us and we will be glad to help.

i have downloaded the web installer, but it doesnt get installed. please help.

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