DxDiagn.dll is a file used by Windows computers to help run the “Microsoft DirectX Diagnostic Tool“, which is basically a program which analyses how effective your graphics are running on your system. Although the DxDiag.dll file is extremely important for the smooth operation of the DirectX program on your PC, the fact is that it’s continually being used so much that it will continually become damaged, corrupted or misplaced – leading your system to run much slower and with a lot of errors. 

The errors which generally form from DxDiagn.dll will show in this format:

  • “dxdiagn.dll Not Found”
  • “Cannot find C:Windowssystem32dxdiagn.dll”
  • “This application failed to start because dxdiagn.dll was not found. Re-installing the application may fix this problem.”

The cause of this error is actually very simple – it’s the case that the file in question has either been damaged or corrupted by DirectX. DirectX is a “framework” which Microsoft produced to help play the games and programs which most Windows computers need to run. As a crucial part of the Windows system, it’s continually being used… but as this is the case, DxDiagn.dll (one of its main components) is continually being damaged and corrupted, preventing your system from reading the file, leading it to run extremely unreliably. Fixing this error is actually quite simple if you know how to fix it – you basically need to just repair any of the problems with the DirectX software on your PC, which can be done quite easily.

The first step to fixing this error is to upgrade or repair Directx. Unfortunately, because this is a crucial part of your system, you cannot uninstall it… however, you can easily upgrade or repair it by downloading the installer from Microsoft’s website and then letting it run. This should replace the damaged DxDiagn.dll on your PC with a fresh copy, allowing your system to run much more reliably again. If you try and that and it does not work, then you may also wish to place a new version of the DxDiagn.dll file onto your PC, with one downloaded from the Internet.

The second step to fixing this error is to use what’s known as a “registry cleaner” tool. These software programs clean out the “registry database” of your computer, which is where all the files & settings are stored for Windows. One of the biggest causes of DLL errors is actually down to the registry database corrupting a large list of DLL files your computer has. This list is used by all your computer software to help load up the various files they require to run… and are therefore amongst the most important parts of the entire Windows system. If you still get DXDiag errors after step 1, you should look to use a registry cleaner to repair any further issues you may have on your system.

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