DirectX erreur interne installation

Bonjour,
j'ai voulu mettre à jour ma version de direcx pour un jeu, et impossible de l'installer, il m'affiche :
"Une erreur système interne s'est produite."
voici le contenu du fichier DXError.log :

[11/11/11 20:40:50] module: DXWSetup(Mar 30 2011), file: psheets.cpp, line: 705, function: PreinstDlgProc    

    CDXWSetup::InitInstallEngine() failed.   

celui du fichier DirectX.log :

11/11/11 20:46:02: DXWSetup: ***** DXWSETUP *****    
11/11/11 20:46:02: DXWSetup: WinMain()    
11/11/11 20:46:02: DXWSetup: IsIA64(): not IA64.    
11/11/11 20:46:02: DXWSetup: Unable to get Version on target file C:\Windows\system32\directx\websetup\dsetup.dll    
11/11/11 20:46:02: DXWSetup: Installed file C:\Windows\system32\directx\websetup\dsetup.dll    
11/11/11 20:46:02: DXWSetup: Unable to get Version on target file C:\Windows\system32\directx\websetup\dsetup32.dll    
11/11/11 20:46:02: DXWSetup: Installed file C:\Windows\system32\directx\websetup\dsetup32.dll    
11/11/11 20:46:02: DXWSetup: GetDXVersion(): This may be a older DirectX which does not have the directx key in the registry.    
11/11/11 20:46:02: DXWSetup: DirectX Version: 0.00.00.0000.00    
11/11/11 20:46:03: DXWSetup: Setup Version: 4.09.00.0904.00    
11/11/11 20:46:06: DXWSetup: CDXWSetup::CDXWSetup()    
11/11/11 20:46:06: DXWSetup: CDXWSetup::DownloadDXUpdate()    
11/11/11 20:46:06: DXWSetup: OnEngineStatusChange(): EngineStatus = 0x1, SubStatus = 0x0    
11/11/11 20:46:07: DXWSetup: OnEngineStatusChange(): EngineStatus = 0x3, SubStatus = 0x0    
11/11/11 20:46:07: DXWSetup: OnEngineStatusChange(): EngineStatus = 0x2, SubStatus = 0x0    
11/11/11 20:46:07: DXWSetup: OnStartInstall(): DLSize = 81, InstallSize = 0    
11/11/11 20:46:07: DXWSetup: OnStartComponent(): ID = DXUpdate, DLSize = 81, InstallSize = 0, str = %DirectX_Setup%    
11/11/11 20:46:07: DXWSetup: OnComponentProgress(): Phase = 0, Progress = 0    
11/11/11 20:46:08: DXWSetup: OnStopComponent(): ID = DXUpdate, hr = 0x0, Phase = 9, str = %DirectX_Setup%, status = 0x0    
11/11/11 20:46:08: DXWSetup: OnStopInstall(): hr = 0x0, str = (null), status = 0x0    
11/11/11 20:46:08: DXWSetup: OnEngineStatusChange(): EngineStatus = 0x3, SubStatus = 0x0    
11/11/11 20:46:08: DXWSetup: WM_APP_DOWNLOADDXUPDATE    
11/11/11 20:46:08: DXWSetup: CDXWSetup::InitInstallEngine()    
11/11/11 20:46:08: DXWSetup: CDXWSetup::InitInstallEngine(): Sections are not initialized.    
11/11/11 20:46:08: DXWSetup: PreinstDlgProc(): CDXWSetup::InitInstallEngine() failed.    
11/11/11 20:46:08: DXWSetup: WM_APP_ENDDOWNLOAD    
11/11/11 20:46:09: DXWSetup: CDXWSetup::~CDXWSetup()    
11/11/11 20:46:09: DXWSetup: CreatePropertySheet() returns -9.    
11/11/11 20:46:09: DXWSetup: Deleted file C:\Windows\system32\directx\websetup\dsetup.dll.    
11/11/11 20:46:10: DXWSetup: Deleted file C:\Windows\system32\directx\websetup\dsetup32.dll.   

besoin d'aide, c'est assez urgent ! merci