Hey I'm having the exact same problem as Spacerik, but the thing is I can't update my directX because it always fails to install. It refers to two log files, DirectX.log and DXError.log, that I should read but I'm not sure how to interpret them or what to do next.
I'm using vista64 and I already have DirectX 10 installed.
I hope no one minds if I paste the stuff that's in those files.
DXError.log:
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[04/25/09 13:42:31] module: DXWSetup(Mar 16 2009), file: dxwsetup.cpp, line: 219, function: CDXWSetup::InitInstallEngine
Sections are not initialized.
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[04/25/09 13:42:31] module: DXWSetup(Mar 16 2009), file: psheets.cpp, line: 472, function: PreinstDlgProc
CDXWSetup::InitInstallEngine() failed.
DirectX.log:
04/25/09 13:54:09: DXWSetup: ***** DXWSETUP *****
04/25/09 13:54:09: DXWSetup: WinMain()
04/25/09 13:54:09: DXWSetup: IsIA64(): not IA64.
04/25/09 13:54:09: DXWSetup: Unable to get Version on target file C:\Windows\system32\directx\websetup\dsetup.dll
04/25/09 13:54:09: DXWSetup: Installed file C:\Windows\system32\directx\websetup\dsetup.dll
04/25/09 13:54:09: DXWSetup: Unable to get Version on target file C:\Windows\system32\directx\websetup\dsetup32.dll
04/25/09 13:54:09: DXWSetup: Installed file C:\Windows\system32\directx\websetup\dsetup32.dll
04/25/09 13:54:09: DXWSetup: GetDXVersion(): Unable to get RC string from registry.
04/25/09 13:54:09: DXWSetup: DirectX Version: 4.09.00.0904.00
04/25/09 13:54:09: DXWSetup: Setup Version: 4.09.00.0904.00
04/25/09 13:54:09: DXWSetup: A newer version of DirectX have been installed already.
04/25/09 13:54:09: dsetup32: IsWow64(): running on Wow64.
04/25/09 13:54:11: DXWSetup: CDXWSetup::CDXWSetup()
04/25/09 13:54:11: DXWSetup: CDXWSetup:

ownloadDXUpdate()
04/25/09 13:54:11: DXWSetup: OnEngineStatusChange(): EngineStatus = 0x1, SubStatus = 0x0
04/25/09 13:54:11: DXWSetup: OnEngineStatusChange(): EngineStatus = 0x3, SubStatus = 0x0
04/25/09 13:54:11: DXWSetup: OnEngineStatusChange(): EngineStatus = 0x2, SubStatus = 0x0
04/25/09 13:54:11: DXWSetup: OnStartInstall(): DLSize = 81, InstallSize = 0
04/25/09 13:54:11: DXWSetup: OnStartComponent(): ID = DXUpdate, DLSize = 81, InstallSize = 0, str = %DirectX_Setup%
04/25/09 13:54:11: DXWSetup: OnComponentProgress(): Phase = 0, Progress = 0
04/25/09 13:54:12: DXWSetup: OnStopComponent(): ID = DXUpdate, hr = 0x0, Phase = 9, str = %DirectX_Setup%, status = 0x0
04/25/09 13:54:12: DXWSetup: OnStopInstall(): hr = 0x0, str = (null), status = 0x0
04/25/09 13:54:12: DXWSetup: OnEngineStatusChange(): EngineStatus = 0x3, SubStatus = 0x0
04/25/09 13:54:12: DXWSetup: WM_APP_DOWNLOADDXUPDATE
04/25/09 13:54:12: DXWSetup: CDXWSetup::InitInstallEngine()
04/25/09 13:54:12: DXWSetup: CDXWSetup::InitInstallEngine(): Sections are not initialized.
04/25/09 13:54:12: DXWSetup: PreinstDlgProc(): CDXWSetup::InitInstallEngine() failed.
04/25/09 13:54:12: DXWSetup: WM_APP_ENDDOWNLOAD
Any help is greatly appreciated, thanks.