Bonjour,
J'ai, depuis une date récente, des problèmes de redirections automatiques non souhaitées depuis Google. J'ai téléchargé Hijack this sur le forum et fait un scan dont voici le compte-rendu :

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 10:20:35, on 05/11/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
Boot mode: Normal

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\csrss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Lavasoft\Ad-Aware 2007\aawservice.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\CA\eTrust EZ Armor\eTrust EZ Antivirus\ISafe.exe
D:\Program Files\Alcohol Soft\Alcohol 120\StarWind\StarWindServiceAE.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\tgbstarter.exe
C:\Program Files\MINDSCAPE\MCF\TGBBOB.exe
C:\Program Files\Neuf\Kit\WiFi\9wifi.exe
C:\Program Files\CA\eTrust EZ Armor\eTrust EZ Antivirus\CAVRID.exe
C:\Program Files\CA\eTrust EZ Armor\eTrust EZ Antivirus\CAVTray.exe
C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe­
D:\Program Files\RamBoost XP\rambxpfr.exe
C:\WINDOWS\System32\alg.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WLLoginProxy.exe
C:\WINDOWS\explorer.exe
D:\Program Files\Mozilla Firefox\firefox.exe
C:\Hijack This\HijackThis.exe
C:\WINDOWS\system32\wbem\wmiprvse.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.files-ftp.com/~unicorni/phpBB2/index.php
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.files-ftp.com/~unicorni/phpBB2/index.php
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: Aide pour le lien d'Adobe PDF Reader - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Fichiers communs\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Programme d'aide de l'Assistant de connexion Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4D91-8333-CF10577473F7} - C:\Program Files\Google\googletoolbar1.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files\Google\GoogleToolbarNotifier\2.0.301.7164\swg.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar3.dll
O4 - HKLM\..\Run: [Autoconfigurateur WiFi Neuf] "C:\Program Files\Neuf\Kit\WiFi\9wifi.exe"
O4 - HKLM\..\Run: [CAVRID] "C:\Program Files\CA\eTrust EZ Armor\eTrust EZ Antivirus\CAVRID.exe"
O4 - HKLM\..\Run: [CaAvTray] "C:\Program Files\CA\eTrust EZ Armor\eTrust EZ Antivirus\CAVTray.exe"
O4 - HKLM\..\Run: [MSConfig] C:\WINDOWS\PCHealth\HelpCtr\Binaries\MSConfig.exe /auto
O4 - HKCU\..\Run: [swg] C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
O4 - HKCU\..\Run: [RamBoostXp] D:\Program Files\RamBoost XP\rambxpfr.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O14 - IERESET.INF: START_PAGE_URL=http://www.files-ftp.com/~unicorni/phpBB2/index.php
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O16 - DPF: {201B9B37-848F-40BD-90EA-7B8F0AA89D6A} - http://scripts.dlv4.com/binaries/egaccess4/egaccess4_1071_em_XP.cab
O16 - DPF: {CD995117-98E5-4169-9920-6C12D4C0B548} (HGPlugin9USA Class) - http://gamedownload.ijjimax.com/gamedownload/dist/hgstart/HGPlugin9USA.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{5321813C-8128-4960-9EA6-32EAEF824B08}: NameServer = 208.67.220.220,208.67.222.222
O17 - HKLM\System\CCS\Services\Tcpip\..\{75A87AB0-88F2-4496-89A2-3B1B3D067E7D}: NameServer = 85.255.114.45,85.255.112.112
O17 - HKLM\System\CCS\Services\Tcpip\..\{851D876E-D662-4335-8FD1-83F9AD27D6E7}: NameServer = 85.255.114.45,85.255.112.112
O17 - HKLM\System\CCS\Services\Tcpip\..\{C8664569-E751-4E6C-BCC6-7D4EBDE5BBCC}: NameServer = 85.255.114.45,85.255.112.112
O17 - HKLM\System\CCS\Services\Tcpip\..\{C89EB3FA-1DCE-4EE5-9F06-14A0C51C447B}: NameServer = 85.255.114.45,85.255.112.112
O17 - HKLM\System\CCS\Services\Tcpip\..\{EF860EC7-E442-4EDD-838E-AE92F95BBA96}: NameServer = 85.255.114.45,85.255.112.112
O17 - HKLM\System\CS1\Services\Tcpip\Parameters: NameServer = 208.67.220.220,208.67.222.222
O17 - HKLM\System\CS2\Services\Tcpip\Parameters: NameServer = 208.67.220.220,208.67.222.222
O17 - HKLM\System\CCS\Services\Tcpip\Parameters: NameServer = 208.67.220.220,208.67.222.222
O20 - Winlogon Notify: TGBBOB - C:\WINDOWS\SYSTEM32\TGBBOBNotif.dll
O23 - Service: Ad-Aware 2007 Service (aawservice) - Lavasoft AB - C:\Program Files\Lavasoft\Ad-Aware 2007\aawservice.exe
O23 - Service: CAISafe - Computer Associates International, Inc. - C:\Program Files\CA\eTrust EZ Armor\eTrust EZ Antivirus\ISafe.exe
O23 - Service: StarWind AE Service (StarWindServiceAE) - Rocket Division Software - D:\Program Files\Alcohol Soft\Alcohol 120\StarWind\StarWindServiceAE.exe
O23 - Service: TGB::BOB! Starter - Unknown owner - C:\WINDOWS\system32\tgbstarter.exe
O23 - Service: TGB::BOB! (TGBBOB) - SISTECH - TheGreenBow - C:\Program Files\MINDSCAPE\MCF\TGBBOB.exe
End of file - 5759 bytes

Que dois-je faire ensuite s'il-vous-plait ??

Configuration: Windows XP
Firefox 2.0.0.9