Installation DirectX

Bonsoir, depuis un moment, j'ai un problème avec DirectX.
Je veux installer Open Broadcaster Software, mais au début de l'installation, il me met le message d'erreur suivant:

Your system is missing DirectX components that Open Broadcaster Software requires. Whould you like to download them?

Cela me dirige sur cette page: http://www.microsoft.com/en-us/download/details.aspx?id=35
Je prends la version française, j'obtiens le fichier dxwebsetup.exe, je lance l'installation et j'obtiens le message d'erreur

Une erreur système interne s'est produite. Consultez les fichiers DXError.log et DirectX.log situés dans le dossier Windows pour déterminer le problème.

Je fais une recherche et j'ai que le fichier DirectX.log:

06/16/14 20:26:21: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DX5985.tmp\d3dx9_24_x64.inf [DefaultInstall]
06/16/14 20:26:21: infinst: Installed file C:\Windows\system32\d3dx9_24.dll
06/19/14 19:15:52: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DXC400.tmp\xinput1_3_x64.inf [Install_Driver]
06/19/14 19:15:52: infinst: Installed file C:\Windows\system32\xinput1_3.dll
06/26/14 16:47:40: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DX5910.tmp\d3dx9_25_x64.inf [DefaultInstall]
06/26/14 16:47:40: infinst: Installed file C:\Windows\system32\d3dx9_25.dll
06/27/14 16:34:43: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DXAFD5.tmp\d3dx9_25_x64.inf [DefaultInstall]
06/27/14 16:34:43: infinst: Target file: 'C:\Windows\system32\d3dx9_25.dll' 
 Target file is Version 9.6.168.0
 Source file is Version 9.6.168.0
06/27/14 16:34:43: infinst: C:\Windows\system32\d3dx9_25.dll have been installed already.
06/27/14 16:34:44: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DXAFD5.tmp\d3dx9_26_x64.inf [DefaultInstall]
06/27/14 16:34:44: infinst: Installed file C:\Windows\system32\d3dx9_26.dll
06/28/14 14:09:33: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DXB1A7.tmp\d3dx9_25_x64.inf [DefaultInstall]
06/28/14 14:09:33: infinst: Target file: 'C:\Windows\system32\d3dx9_25.dll' 
 Target file is Version 9.6.168.0
 Source file is Version 9.6.168.0
06/28/14 14:09:33: infinst: C:\Windows\system32\d3dx9_25.dll have been installed already.
06/28/14 14:09:35: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DXB1A7.tmp\d3dx9_26_x64.inf [DefaultInstall]
06/28/14 14:09:35: infinst: Target file: 'C:\Windows\system32\d3dx9_26.dll' 
 Target file is Version 9.7.239.0
 Source file is Version 9.7.239.0
06/28/14 14:09:35: infinst: C:\Windows\system32\d3dx9_26.dll have been installed already.
06/28/14 14:09:35: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DXB1A7.tmp\d3dx9_27_x64.inf [DefaultInstall]
06/28/14 14:09:35: infinst: Installed file C:\Windows\system32\d3dx9_27.dll
06/28/14 14:11:43: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DXB511.tmp\d3dx9_25_x64.inf [DefaultInstall]
06/28/14 14:11:43: infinst: Target file: 'C:\Windows\system32\d3dx9_25.dll' 
 Target file is Version 9.6.168.0
 Source file is Version 9.6.168.0
06/28/14 14:11:43: infinst: C:\Windows\system32\d3dx9_25.dll have been installed already.
06/28/14 14:11:43: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DXB511.tmp\d3dx9_26_x64.inf [DefaultInstall]
06/28/14 14:11:43: infinst: Target file: 'C:\Windows\system32\d3dx9_26.dll' 
 Target file is Version 9.7.239.0
 Source file is Version 9.7.239.0
06/28/14 14:11:43: infinst: C:\Windows\system32\d3dx9_26.dll have been installed already.
06/28/14 14:11:44: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DXB511.tmp\d3dx9_27_x64.inf [DefaultInstall]
06/28/14 14:11:44: infinst: Target file: 'C:\Windows\system32\d3dx9_27.dll' 
 Target file is Version 9.8.299.0
 Source file is Version 9.8.299.0
06/28/14 14:11:44: infinst: C:\Windows\system32\d3dx9_27.dll have been installed already.
06/28/14 14:11:44: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DXB511.tmp\d3dx9_28_x64.inf [DefaultInstall]
06/28/14 14:11:45: infinst: Installed file C:\Windows\system32\d3dx9_28.dll
06/29/14 21:20:03: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DX3079.tmp\d3dx9_25_x64.inf [DefaultInstall]
06/29/14 21:20:03: infinst: Target file: 'C:\Windows\system32\d3dx9_25.dll' 
 Target file is Version 9.6.168.0
 Source file is Version 9.6.168.0
06/29/14 21:20:03: infinst: C:\Windows\system32\d3dx9_25.dll have been installed already.
06/29/14 21:20:04: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DX3079.tmp\d3dx9_26_x64.inf [DefaultInstall]
06/29/14 21:20:04: infinst: Target file: 'C:\Windows\system32\d3dx9_26.dll' 
 Target file is Version 9.7.239.0
 Source file is Version 9.7.239.0
06/29/14 21:20:04: infinst: C:\Windows\system32\d3dx9_26.dll have been installed already.
06/29/14 21:20:05: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DX3079.tmp\d3dx9_27_x64.inf [DefaultInstall]
06/29/14 21:20:05: infinst: Target file: 'C:\Windows\system32\d3dx9_27.dll' 
 Target file is Version 9.8.299.0
 Source file is Version 9.8.299.0
06/29/14 21:20:05: infinst: C:\Windows\system32\d3dx9_27.dll have been installed already.
06/29/14 21:20:06: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DX3079.tmp\d3dx9_28_x64.inf [DefaultInstall]
06/29/14 21:20:06: infinst: Target file: 'C:\Windows\system32\d3dx9_28.dll' 
 Target file is Version 9.10.455.0
 Source file is Version 9.10.455.0
06/29/14 21:20:06: infinst: C:\Windows\system32\d3dx9_28.dll have been installed already.
06/29/14 21:20:06: infinst: Installing C:\Users\sang47Fr\AppData\Local\Temp\DX3079.tmp\d3dx9_29_x64.inf [DefaultInstall]
06/29/14 21:20:06: infinst: Installed file C:\Windows\system32\d3dx9_29.dll

Après, j'ai aussi un problème avec le jeu Outlast, qui me dis:

Impossible de démarrer le programme car il manque D3DCOMPILER_43.dll sur votre ordinateur. Essayer de réinstaller le programme pour corriger ce problème

Solution? Cordialement.

En Informatique:
des problèmes peuvent être réparer, d'autre pas mets on peut toujours trouver une solution