pas possible installer ie8

Bonjour,

le programme d'installation s'arrête sur la 3è ligne l'installation
proprement dite d'ie8 !
voici le log ie8.log
pouvez-vous m'aider j'ai xp sp3 et ie7, je n'ai pas installé la beta1 avant.
qu'en sera-t-il pour l'installation de la vesion officielle via WU ?
aurais-je les mêmes difficultées ?

merci

0.380:
==
0.401: 2008/09/18 18:50:16.942 (local)
0.401: c:\16291e5a6fc67cc2b42376b6fb7341\update\update.exe (version 6.3.15.0)
0.421: Hotfix started with following command line: /quiet /norestart /er
/log:C:\WINDOWS
0.471: In Function GetReleaseSet, line 1211, RegOpenKeyEx failed with error
0x2
0.471: In Function GetReleaseSet, line 1240, RegOpenKeyEx failed with error
0x2
0.491: IECUSTOM: Scanning for proper registry permissions
1.061: IECUSTOM: Unwriteable key
HKCR\Interface\{34A715A0-6587-11D0-924A-0020AFC7AC4D}
1.061: IECUSTOM: Unwriteable key
HKCR\Interface\{34A715A0-6587-11D0-924A-0020AFC7AC4D}\ProxyStubClsid
1.061: IECUSTOM: Unwriteable key
HKCR\Interface\{34A715A0-6587-11D0-924A-0020AFC7AC4D}
1.061: IECUSTOM: Unwriteable key
HKCR\Interface\{34A715A0-6587-11D0-924A-0020AFC7AC4D}\ProxyStubClsid32
1.061: IECUSTOM: Unwriteable key
HKCR\Interface\{34A715A0-6587-11D0-924A-0020AFC7AC4D}
1.061: IECUSTOM: Unwriteable key
HKCR\Interface\{34A715A0-6587-11D0-924A-0020AFC7AC4D}\TypeLib
1.061: IECUSTOM: Unwriteable key
HKCR\Interface\{34A715A0-6587-11D0-924A-0020AFC7AC4D}
1.061: IECUSTOM: Unwriteable key
HKCR\Interface\{34A715A0-6587-11D0-924A-0020AFC7AC4D}\TypeLib
1.061: IECUSTOM: Unwriteable key
HKCR\Interface\{34A715A0-6587-11D0-924A-0020AFC7AC4D}
1.332: IECUSTOM: Scanning for proper registry permissions
1.622: IECUSTOM: Scanning for proper registry permissions
1.993: IECUSTOM: Unwriteable key
HKCR\Interface\{34A715A0-6587-11D0-924A-0020AFC7AC4D}
2.073: IECUSTOM: Backing up registry permissions
2.083: IECUSTOM: Finished backing up registry permissions
2.083: IECUSTOM: Setting new registry permissions
2.103: IECUSTOM: Unable to clear DACLs
HKCR\Interface\{34A715A0-6587-11D0-924A-0020AFC7AC4D}
2.103: IECUSTOM: Finished setting new registry permissions
2.103: IECUSTOM: An error occured verifying registry permissions. ERROR:
0x80070534
2.103: DoInstallation: CustomizeCall Failed: 0x3f5
2.113: IECUSTOM: Restoring registry permissions
2.113: IECUSTOM: Finished restoring registry permissions
2.113: Impossible d'écrire la clé du Registre de configuration.
2.123: L'installation du Internet Explorer 8 ne s'est pas terminée.
2.123: Update.exe extended error code = 0x3f5