J'arrive pas à installer ocun anti virus

Bonjour,
j'arrive pas à installer ocun antivirus, ils disent qu'il ya une erreur , le dernier avast ma doné les raisons que voici (j'y comprend rien) svp aidez moi. merci.

02.04.2009 21:30:59 general: Started: 02.04.2009, 21:30:59
02.04.2009 21:30:59 general: Running setup_av_pro-537 (1335)
02.04.2009 21:30:59 system: Operating system: Windows Vista ver 6.0, build 6001, sp 1.0 [Service Pack 1]
02.04.2009 21:30:59 system: Memory: 54% load. Phys:825736/1830992K free, Page:1626768/3912892K free, Virt:2028584/2097024K free
02.04.2009 21:30:59 system: Computer WinName: OSMANE
02.04.2009 21:30:59 system: Windows Net User: OSMANE\client
02.04.2009 21:30:59 general: Cmdline: /sfx /sfxstorage "C:\Users\client\AppData\Local\Temp\_av_sfx.tm~a07520" /srcpath "C:\Users\client\INSTAL~1" /sfxname "setupfre"
02.04.2009 21:30:59 general: DldSrc set to sfx
02.04.2009 21:30:59 general: Old version: ffffffff (-1)
02.04.2009 21:30:59 registry: Deleted registry: Software\Alwil Software\Avast\4.0\UpdateReady
02.04.2009 21:30:59 general: Install check: SetupVersion does NOT exist
02.04.2009 21:30:59 general: SGW32P::CheckIfInstalled set m_bAlreadyInstalled to 0
02.04.2009 21:30:59 registry: Get registry: Software\Microsoft\Internet Explorer\Version=7.0.6001.18000
02.04.2009 21:30:59 general: Operation set to INST_OP_INSTALL
02.04.2009 21:30:59 general: GUID: bf491f41-b045-4a94-a08e-269e4f107c45
02.04.2009 21:30:59 general: SelectCurrent: selected server 'tmp sfx storage' from 'sfx'
02.04.2009 21:31:00 internet: SYNCER: Type: use IE settings
02.04.2009 21:31:00 internet: SYNCER: Auth: another authentication, use WinInet
02.04.2009 21:31:00 general: Entered SetupProcessPro::Do( INST_OP_INSTALL )
02.04.2009 21:31:00 general: Entered SetupProcessWin32Avast::Do( INST_OP_INSTALL )
02.04.2009 21:31:00 general: Entered SetupProcessWin32::Do( INST_OP_INSTALL )
02.04.2009 21:31:00 general: Entered SetupProcess::Do( INST_OP_INSTALL )
02.04.2009 21:31:06 file: Destination folder: C:\Program Files\Alwil Software\Avast4
02.04.2009 21:31:06 general: Operation set to INST_OP_INSTALL
02.04.2009 21:31:08 general: Selected group: Skins
02.04.2009 21:31:08 general: Selected group: Instant Messaging
02.04.2009 21:31:08 general: Selected group: P2P Shield
02.04.2009 21:31:08 general: Selected group: Internet Mail
02.04.2009 21:31:08 general: Selected group: Outlook/Exchange
02.04.2009 21:31:08 general: Selected group: Network Shield
02.04.2009 21:31:08 general: Selected group: Web Shield
02.04.2009 21:31:08 general: Selected group: Standard Shield
02.04.2009 21:31:08 general: Selected group: French language extension
02.04.2009 21:31:08 general: Selected group: French help
02.04.2009 21:31:09 general: progress thread start
02.04.2009 21:31:09 internet: SYNCER: Agent=Syncer/4.80 (av_pro-1335;f)

Configuration: Windows Vista
Internet Explorer 7.0