Je ne peut pas installer IE8 RC1

Bonjour,
Depuis 2 semaines j'essaie d'installer ie8 pour mon pere qui refuse d'utiliser autre chose car certains sites ne marchent pas avec les autres navigateurs.

recement j'ai donc telecharge ie8 rc1 mais je n'arrive pas a l'installer. J'ai suivi tout les conseils du site MS mais je n'arrive a rien.

voici la fin du log:

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07:17.266: INFO:    |IEAK After IE    >>> CPageProgress::_ChangeState: Original Phase: 9
07:17.297: INFO:    |Inst. Post-Upd.  >>> >[BEGIN]------------------------------
07:17.297: INFO:    |Inst. Post-Upd.  >>> CPageProgress::_UpdateDisplay: Actual Phase: 10
07:17.329: INFO:    |Inst. Post-Upd.  >>> SKIP[FALSE]>>Looking for skip clauses
07:17.344: INFO:    |Inst. Post-Upd.  >>> SKIP[FALSE]>> Adding [FALSE] Condition: !_psdStateData->GetIsInitSuccessful()
07:17.360: INFO:    |Inst. Post-Upd.  >>> SKIP[FALSE]>> Adding [TRUE ] Condition: !g_pApp->GetState()->GetOptShouldUpdate()
07:17.375: INFO:    |Inst. Post-Upd.  >>> SKIP[TRUE ]>> Adding [TRUE ] Condition: !g_pApp->GetState()->GetResultCouldInstallIE()
07:17.391: INFO:    |Inst. Post-Upd.  >>> SKIP[TRUE ]>> Adding [TRUE ] Condition: g_pApp->GetState()->GetResultPostIEUpdateState()!=WU_COULD_DOWNLOAD
07:17.407: INFO:    |Inst. Post-Upd.  >>> SKIP[TRUE ]>> Adding [FALSE] Condition: g_pApp->GetState()->GetOptIEAKMode()==IEAK_BRANDING
07:17.422: INFO:    |Inst. Post-Upd.  >>> SKIP[TRUE ]>> Adding [FALSE] Condition: g_pApp->GetState()->AreWeDoingUninstall()
07:17.438: INFO:    |Inst. Post-Upd.  >>> SKIP[TRUE ]>> Adding [FALSE] Condition: !g_pApp->GetState()->GetPrerequisiteSatisfied()
07:17.454: INFO:    |Inst. Post-Upd.  >>> SKIP[TRUE ]>>Result: SKIPPING This Phase
07:17.469: INFO:    |Inst. Post-Upd.  >>> CInstallationState::_ExitState: Preparing to Leave State.
07:17.485: INFO:    |Inst. Post-Upd.  >>> CInstallationState::_ExitState: Setting Progress 100.
07:17.500: INFO:    |Inst. Post-Upd.  >>> CInstallationState::_SetProgress: Post Set Progress Message Succeeded.
07:17.516: INFO:    |Inst. Post-Upd.  >>> CInstallationState::_ExitState: Posting Exit Phase Message.
07:17.547: INFO:    |Inst. Post-Upd.  >>> CInstallationState::_ExitState: Post Exit Phase Message Succeeded.
07:17.579: INFO:    |Inst. Post-Upd.  >>> CPageProgress::DlgProc: Received WM_PR_SETPROGRESS, 64, 0
07:17.594: INFO:    |Inst. Post-Upd.  >>> CPageProgress::_UpdateDisplay: Actual Phase: 10
07:17.610: INFO:    |Inst. Post-Upd.  >>> CPageProgress::DlgProc: Received WM_PR_EXITPHASE, 0, 0
07:17.625: INFO:    Setting Windows Update Registry Keys: LookingForUpdates=0x00 - ForcePostUpdateDownload=0x00 - ForcePostUpdateInstall=0x00
07:17.641: INFO:    |Inst. Post-Upd.  >>> CPageProgress::_UpdateDisplay: Actual Phase: 10
07:17.657: INFO:    |Inst. Post-Upd.  >>> <[END]--------------------------------
07:17.672: INFO:    |Inst. Post-Upd.  >>> CPageProgress::_ChangeState: Original Phase: 10
07:17.688: INFO:    |IEAK After IEUPD >>> >[BEGIN]------------------------------
07:17.704: INFO:    |IEAK After IEUPD >>> CPageProgress::_UpdateDisplay: Actual Phase: 11
07:17.719: INFO:    |IEAK After IEUPD >>> SKIP[FALSE]>>Looking for skip clauses
07:17.735: INFO:    |IEAK After IEUPD >>> SKIP[FALSE]>> Adding [FALSE] Condition: !_psdStateData->GetIsInitSuccessful()
07:17.750: INFO:    |IEAK After IEUPD >>> SKIP[FALSE]>> Adding [TRUE ] Condition: g_pApp->GetState()->GetOptIEAKMode()!=IEAK_PACKAGE
07:17.766: INFO:    |IEAK After IEUPD >>> SKIP[TRUE ]>> Adding [FALSE] Condition: g_pApp->GetState()->AreWeDoingUninstall()
07:17.797: INFO:    |IEAK After IEUPD >>> SKIP[TRUE ]>> Adding [FALSE] Condition: !g_pApp->GetState()->GetPrerequisiteSatisfied()
07:17.797: INFO:    |IEAK After IEUPD >>> SKIP[TRUE ]>>Result: SKIPPING This Phase
07:17.829: INFO:    |IEAK After IEUPD >>> CInstallationState::_ExitState: Preparing to Leave State.
07:17.844: INFO:    |IEAK After IEUPD >>> CInstallationState::_ExitState: Setting Progress 100.
07:17.860: INFO:    |IEAK After IEUPD >>> CInstallationState::_SetProgress: Post Set Progress Message Succeeded.
07:17.875: INFO:    |IEAK After IEUPD >>> CInstallationState::_ExitState: Posting Exit Phase Message.
07:17.891: INFO:    |IEAK After IEUPD >>> CInstallationState::_ExitState: Post Exit Phase Message Succeeded.
07:17.907: INFO:    |IEAK After IEUPD >>> CPageProgress::DlgProc: Received WM_PR_SETPROGRESS, 64, 0
07:17.922: INFO:    |IEAK After IEUPD >>> CPageProgress::_UpdateDisplay: Actual Phase: 11
07:17.938: INFO:    |IEAK After IEUPD >>> CPageProgress::DlgProc: Received WM_PR_EXITPHASE, 0, 0
07:17.954: INFO:    |IEAK After IEUPD >>> CPageProgress::_UpdateDisplay: Actual Phase: 11
07:17.969: INFO:    |IEAK After IEUPD >>> <[END]--------------------------------
07:17.985: INFO:    |IEAK After IEUPD >>> CPageProgress::_ChangeState: Original Phase: 11
07:18.016: INFO:    |IEAK Finalize    >>> >[BEGIN]------------------------------
07:18.032: INFO:    |IEAK Finalize    >>> CPageProgress::_UpdateDisplay: Actual Phase: 12
07:18.047: INFO:    |IEAK Finalize    >>> SKIP[FALSE]>>Looking for skip clauses
07:18.063: INFO:    |IEAK Finalize    >>> SKIP[FALSE]>> Adding [FALSE] Condition: !_psdStateData->GetIsInitSuccessful()
07:18.079: INFO:    |IEAK Finalize    >>> SKIP[FALSE]>> Adding [TRUE ] Condition: g_pApp->GetState()->GetOptIEAKMode()==IEAK_NONE
07:18.094: INFO:    |IEAK Finalize    >>> SKIP[TRUE ]>> Adding [FALSE] Condition: g_pApp->GetState()->AreWeDoingUninstall()
07:18.110: INFO:    |IEAK Finalize    >>> SKIP[TRUE ]>> Adding [FALSE] Condition: !g_pApp->GetState()->GetPrerequisiteSatisfied()
07:18.125: INFO:    |IEAK Finalize    >>> SKIP[TRUE ]>>Result: SKIPPING This Phase
07:18.141: INFO:    |IEAK Finalize    >>> CInstallationState::_ExitState: Preparing to Leave State.
07:18.204: INFO:    |IEAK Finalize    >>> CInstallationState::_ExitState: Setting Progress 100.
07:18.235: INFO:    |IEAK Finalize    >>> CInstallationState::_SetProgress: Post Set Progress Message Succeeded.
07:18.266: INFO:    |IEAK Finalize    >>> CInstallationState::_ExitState: Posting Exit Phase Message.
07:18.282: INFO:    |IEAK Finalize    >>> CInstallationState::_ExitState: Post Exit Phase Message Succeeded.
07:18.297: INFO:    |IEAK Finalize    >>> CPageProgress::DlgProc: Received WM_PR_SETPROGRESS, 64, 0
07:18.313: INFO:    |IEAK Finalize    >>> CPageProgress::_UpdateDisplay: Actual Phase: 12
07:18.329: INFO:    |IEAK Finalize    >>> CPageProgress::DlgProc: Received WM_PR_EXITPHASE, 0, 0
07:18.344: INFO:    |IEAK Finalize    >>> CPageProgress::_UpdateDisplay: Actual Phase: 12
07:18.360: INFO:    |IEAK Finalize    >>> <[END]--------------------------------
07:18.375: INFO:    |IEAK Finalize    >>> CPageProgress::_ChangeState: Original Phase: 12
07:18.391: INFO:    |Finalize         >>> >[BEGIN]------------------------------
07:18.407: INFO:    |Finalize         >>> CPageProgress::_UpdateDisplay: Actual Phase: 13
07:18.438: INFO:    |Finalize         >>> SKIP[FALSE]>>Looking for skip clauses
07:18.454: INFO:    |Finalize         >>> SKIP[FALSE]>>Result: RUNNING This Phase
07:18.469: INFO:    |Finalize         >>> CInstallationState::_ExitState: Preparing to Leave State.
07:18.485: INFO:    |Finalize         >>> CInstallationState::_ExitState: Setting Progress 100.
07:18.500: INFO:    |Finalize         >>> CInstallationState::_SetProgress: Post Set Progress Message Succeeded.
07:18.516: INFO:    |Finalize         >>> CInstallationState::_ExitState: Posting Exit Phase Message.
07:18.610: INFO:    |Finalize         >>> CInstallationState::_ExitState: Post Exit Phase Message Succeeded.
07:18.672: INFO:    |Finalize         >>> CPageProgress::DlgProc: Received WM_PR_SETPROGRESS, 64, 0
07:18.688: INFO:    |Finalize         >>> CPageProgress::_UpdateDisplay: Actual Phase: 13
07:18.704: INFO:    |Finalize         >>> CPageProgress::DlgProc: Received WM_PR_EXITPHASE, 0, 0
07:18.719: INFO:    |Finalize         >>> CPageProgress::_UpdateDisplay: Actual Phase: 13
07:18.750: INFO:    |Finalize         >>> <[END]--------------------------------
07:18.766: INFO:    |Finalize         >>> CPageProgress::_ChangeState: Original Phase: 13
07:35.016: WARNING: Message to User: It is strongly recommended that you choose "Restart Now" to allow Setup to finish. Some applications may not function correctly until your system is restarted. Are you sure you want to restart later?
07:39.719: INFO:    REBOOT: required.
07:39.829: INFO:    REBOOT: User selected to reboot later.
07:39.891: INFO:    Installer return value: hr=0x00000000
07:40.266: INFO:    Scheduling upload to IE SQM server: http://sqm.microsoft.com/sqm/ie/sqmserver.dll
07:41.625: INFO:    SQM Upload returned 0
07:41.875: INFO:    SQM Upload returned 0
07:41.985: INFO:    SQM Upload returned 0
07:42.079: INFO:    Setup exit code: 0x00000000.
07:42.110: INFO:    Installer Process exit code: 0x00000005.

merci pour toute aide :)