When your computer report isd3dx9_43.dll problems, it's useful to know how to troubleshoot them yourself. Luckily, the methods of repairing the isd3dx9_43.dll problem shouldn't prove to be difficult to execute and you can try all them one by one. If your PC suffered from isd3dx9_43.dll problems, then you can fix it by adopting following steps, please follow the steps below to troubleshoot the issue.
For example, we want to register msi.dll. Follow below steps to complete the register process.
For 32-bit version win7 system:
1.Win + R, type command in the search box, right click on Command Prompt -> Run as administrator.
2.Type cd\, press enter.
3.Type regsvr32 msi.dll, press enter. Click OK on the new appeared window.
System Restore is a feature in Windows 7, Windows Vista, and Windows XP that allows you to revert Windows to a recent point when everything was working fine. It lets you undo changes to the Windows system without altering personal files.
1.Click Start and type "restore" into the Search box. Select "System Restore" from the top of the search results list.
2.Choose your restore point. Windows will automatically select the most recent restore point in which something was installed or changed. The change will be displayed underneath the date the point was created.
3.Confirm that you want to restore. When you select your point, you will be given one more chance to ensure that you want to proceed. Review the point you selected and click the "Finish" button and then "Yes" to start the restore.
4.Wait for the restore to complete. Your system will reboot and the restore process will begin. Be patient, as the restore process can take a while to complete. Once the restore is finished, Windows will load and you will be shown a message confirming that the restore was successful.