>Are you installing avast in the default path?
Yes in the default : C:\Program Files\Alwil Software\Avast4
>Is there only one account with administration rights?
Yes, only one profile.
I tried with the 'the administrator' account accessed in safe mode but it's the same problem.
>Can you post the last 100-150 lines of avast log? C:\Program Files\Alwil Software\Avast4\DATA\log\Setup.log
The directory C:\Program Files\Alwil Software\Avast4\DATA\log\
doesn't exist.
But i have a logfile : C:\Program Files\Alwil Software\Avast4\Setup\setup.log
...
16:54:37 vrb/sys Service avast! Antivirus updated
16:54:37 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswUpdSv\Description=Fournit la mise à jour automatique pour l'antivirus avast!.
16:54:37 vrb/sys Service aswUpdSv installed
16:54:37 vrb/sys Service aswUpdSv dependency (null)
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswUpdSv\Description=Fournit la mise à jour automatique pour l'antivirus avast!.
16:54:38 vrb/sys Service aswUpdSv updated
16:54:38 vrb/sys Reboot set by changed resident C:\WINDOWS\system32\drivers\aavmker4.sys
16:54:38 vrb/sys Driver file copied: C:\WINDOWS\system32\drivers\aavmker4.sys
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\Aavmker4\DisplayName=avast! Asynchronous Virus Monitor
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\Aavmker4\ErrorControl=1
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\Aavmker4\Type=1
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\Aavmker4\Start=1
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswMon2\DisplayName=avast! Standard Shield Support
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswMon2\ErrorControl=1
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswMon2\Type=2
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswMon2\Start=2
16:54:38 vrb/reg Set registry: SOFTWARE\Microsoft\Exchange\Client\Extensions\avast! 4=4.0;C:\Program Files\Alwil Software\Avast4\ashOutXt.dll;1;10000111111000
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\avast! Mail Scanner\Description=Implémente l'analyse du courrier électronique pour l'antivirus avast!.
16:54:38 vrb/sys Service avast! Mail Scanner installed
16:54:38 vrb/sys Service avast! Mail Scanner dependency avast! Antivirus
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\avast! Mail Scanner\Description=Implémente l'analyse du courrier électronique pour l'antivirus avast!.
16:54:38 vrb/sys Service avast! Mail Scanner updated
16:54:38 vrb/sys Reboot set by changed resident C:\WINDOWS\system32\drivers\aswTdi.sys
16:54:38 vrb/sys Driver file copied: C:\WINDOWS\system32\drivers\aswTdi.sys
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswTdi\DisplayName=avast! Network Shield Support
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswTdi\ErrorControl=1
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswTdi\Type=1
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswTdi\Group=PNP_TDI
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswTdi\Start=1
16:54:38 nrm/sys Service 'aswTdi' load order set id=268435456 in group 'PNP_TDI'
16:54:38 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\avast! Web Scanner\Description=Implémente l'analyse du contenu web (HTTP) pour l'antivirus avast!.
16:54:38 vrb/sys Service avast! Web Scanner installed
16:54:38 vrb/sys Service avast! Web Scanner dependency avast! Antivirus
16:54:39 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\avast! Web Scanner\Description=Implémente l'analyse du contenu web (HTTP) pour l'antivirus avast!.
16:54:39 vrb/sys Service avast! Web Scanner updated
16:54:39 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswRdr\DisplayName=aswRdr
16:54:39 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswRdr\ErrorControl=1
16:54:39 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswRdr\Type=1
16:54:39 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswRdr\Start=3
16:54:39 vrb/reg Set registry: SYSTEM\CurrentControlSet\Services\aswRdr\Group=PNP_TDI
16:54:39 vrb/fil Shortcut for ashAvast.exe installed in C:\Documents and Settings\All Users\Menu Démarrer\Programmes\avast! Antivirus
16:54:39 vrb/fil Shortcut for help.chm installed in C:\Documents and Settings\All Users\Menu Démarrer\Programmes\avast! Antivirus
16:54:39 vrb/fil Shortcut for ashAvast.exe installed in C:\Documents and Settings\All Users\Bureau
16:54:39 vrb/reg Set registry: *\shellex\ContextMenuHandlers\avast\(null)={472083B0-C522-11CF-8763-00608CC02F24}
16:54:39 vrb/reg Set registry: avast\ShellEx\ContextMenuHandlers\(null)={472083B0-C522-11CF-8763-00608CC02F24}
16:54:39 vrb/reg Set registry: Folder\shellex\ContextMenuHandlers\avast\(null)={472083B0-C522-11CF-8763-00608CC02F24}
16:54:39 vrb/reg Set registry: CLSID\{472083B0-C522-11CF-8763-00608CC02F24}\(null)=avast
16:54:39 vrb/reg Set registry: CLSID\{472083B0-C522-11CF-8763-00608CC02F24}\InProcServer32\(null)=C:\Program Files\Alwil Software\Avast4\ashShell.dll
16:54:39 vrb/reg Set registry: CLSID\{472083B0-C522-11CF-8763-00608CC02F24}\InProcServer32\ReleaseName=C:\Program Files\Alwil Software\Avast4\ashShell.dll
16:54:39 vrb/reg Set registry: CLSID\{472083B0-C522-11CF-8763-00608CC02F24}\InProcServer32\ThreadingModel=Apartment
16:54:39 vrb/reg Set registry: SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved\{472083B0-C522-11CF-8763-00608CC02F24}=avast
16:54:39 vrb/reg Set registry: SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved\{472083B0-C522-11CF-8763-00608CC02F24}=avast
16:54:39 vrb/reg Set registry: Software\Microsoft\Windows\CurrentVersion\Run\avast!=C:\PROGRA~1\ALWILS~2\Avast4\ashDisp.exe
16:54:39 vrb/fil Fix security on: C:\Program Files\Alwil Software\Avast4\*.*
16:54:39 vrb/fil Fix security on: C:\Program Files\Alwil Software\Avast4\FRENCH\*.*
16:54:39 vrb/fil Fix security on: C:\Program Files\Alwil Software\Avast4\FRENCH\HELP\*.*
16:54:39 vrb/fil Fix security on: C:\Program Files\Alwil Software\Avast4\FRENCH\HtmlData\*.*
16:54:39 vrb/fil Fix security on: C:\Program Files\Alwil Software\Avast4\images\*.*
16:54:39 vrb/reg Set registry: Software\Microsoft\Windows\CurrentVersion\Uninstall\avast!\DisplayName=avast! Antivirus
16:54:39 vrb/reg Set registry: Software\Microsoft\Windows\CurrentVersion\Uninstall\avast!\DisplayVersion=4.7
16:54:39 vrb/reg Set registry: Software\Microsoft\Windows\CurrentVersion\Uninstall\avast!\HelpLink=http://www.avast.com
16:54:39 vrb/reg Set registry: Software\Microsoft\Windows\CurrentVersion\Uninstall\avast!\HelpTelephone=
16:54:39 vrb/reg Set registry: Software\Microsoft\Windows\CurrentVersion\Uninstall\avast!\UrlInfoAbout=http://www.avast.com
16:54:39 vrb/reg Set registry: Software\Microsoft\Windows\CurrentVersion\Uninstall\avast!\UrlUpdateInfo=http://www.avast.com
16:54:39 vrb/reg Set registry: Software\Microsoft\Windows\CurrentVersion\Uninstall\avast!\InstallLocation=C:\PROGRA~1\ALWILS~2\Avast4
16:54:39 vrb/reg Set registry: Software\Microsoft\Windows\CurrentVersion\Uninstall\avast!\InstallSource=D:\INSTAL~2\INSTAL~1\ANTIVI~2
16:54:39 vrb/reg Set registry: Software\Microsoft\Windows\CurrentVersion\Uninstall\avast!\Publisher=Alwil Software
16:54:39 vrb/reg Set registry: Software\Microsoft\Windows\CurrentVersion\Uninstall\avast!\VersionMajor=4
16:54:39 vrb/reg Set registry: Software\Microsoft\Windows\CurrentVersion\Uninstall\avast!\VersionMinor=7
16:54:39 vrb/reg Set registry: Software\Microsoft\Windows\CurrentVersion\Uninstall\avast!\DisplayIcon=C:\Program Files\Alwil Software\Avast4\ashAvast.exe
16:54:39 vrb/reg Set registry: Software\Microsoft\Windows\CurrentVersion\Uninstall\avast!\UninstallString=rundll32 C:\PROGRA~1\ALWILS~2\Avast4\Setup\setiface.dll,RunSetup
16:54:39 min/gen Error loading C:\Program Files\Alwil Software\Avast4\ashBase.dll, error code:0x000003E6
16:54:43 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\Label=May2007
16:54:43 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\Avast4DataFolder=C:\Program Files\Alwil Software\Avast4\DATA
16:54:43 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\Avast4SkinFolder=C:\Program Files\Alwil Software\Avast4\DATA\Skin
16:54:43 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\Version=4.7
16:54:43 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\VersionShort=4.7
16:54:43 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\SetupVersion=1001
16:54:43 nrm/pkg Transferred files: 11
16:54:43 nrm/pkg Transferred bytes: 14532651
16:54:43 nrm/pkg Transfer time: 31 ms
16:54:43 vrb/fil NeedReboot=true
16:54:43 vrb/sys Reboot set by filRenameOnReboot(C:\Program Files\Alwil Software\Avast4\Setup\reboot.txt,)
16:54:43 vrb/fil MoveFileEx(C:\PROGRA~1\ALWILS~2\Avast4\Setup\reboot.txt, NULL)
16:54:43 min/gen Return code: 0x20000000 [Something done]
16:54:43 min/gen Stopped: 07.07.2007, 16:54:43
Thanks