Avis aux spécialistes. 
Voici ce que dit Hijack This: 
  
Logfile of HijackThis v1.99.1 
Scan saved at 18:17:55, on 26/10/2005 
Platform: Windows XP SP2 (WinNT 5.01.2600) 
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180) 
  
Running processes: 
C:\WINDOWS\System32\smss.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\spoolsv.exe 
C:\WINDOWS\Explorer.EXE 
C:\Program Files\AVPersonal\AVGNT.EXE 
C:\Program Files\Prevx Home\SAGUI.exe 
C:\Program Files\PyGrenouille\pygrenouille.exe 
C:\Program Files\Fichiers communs\EPSON\EBAPI\eEBSVC.exe 
C:\PROGRAM FILES\AVPERSONAL\AVGUARD.EXE 
C:\Program Files\AVPersonal\AVWUPSRV.EXE 
C:\Program Files\Fichiers communs\EPSON\EBAPI\SAgent2.exe 
C:\Program Files\Prevx Home\PXAgent.exe 
C:\WINDOWS\system32\svchost.exe 
C:\Program Files\Internet Explorer\iexplore.exe 
C:\WINDOWS\system32\wuauclt.exe 
I:\Download\HijackThis.exe 
  
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.dell.fr/myway 
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://mysearch.myway.com/jsp/dellsidebar.jsp?p=DR 
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://fr.my.yahoo.com/index.html 
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.dell.fr/myway 
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.dell.fr/myway 
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens 
R3 - URLSearchHook: (no name) - {4D25F926-B9FE-4682-BF72-8AB8210D6D75} - C:\Program Files\MyWaySA\SrchAsDe\deSrcAs.dll 
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Acrobat\ActiveX\AcroIEHelper.dll 
O2 - BHO: (no name) - {4D25F921-B9FE-4682-BF72-8AB8210D6D75} - C:\Program Files\MyWaySA\SrchAsDe\deSrcAs.dll 
O2 - BHO: DriveLetterAccess - {5CA3D70E-1895-11CF-8E15-001234567890} - C:\WINDOWS\system32\dla\tfswshx.dll 
O2 - BHO: Norton Internet Security - {9ECB9560-04F9-4bbc-943D-298DDF1699E1} - C:\Program Files\Fichiers communs\Symantec Shared\AdBlocking\NISShExt.dll 
O2 - BHO: AcroIEToolbarHelper Class - {AE7CD045-E861-484f-8273-0445EE161910} - C:\Program Files\Adobe\Acrobat 6.0\Acrobat\AcroIEFavClient.dll 
O2 - BHO: NAV Helper - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Program Files\Norton Internet Security\Norton AntiVirus\NavShExt.dll 
O3 - Toolbar: Norton Internet Security - {0B53EAC3-8D69-4b9e-9B19-A37C9A5676A7} - C:\Program Files\Fichiers communs\Symantec Shared\AdBlocking\NISShExt.dll 
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - C:\Program Files\Norton Internet Security\Norton AntiVirus\NavShExt.dll 
O3 - Toolbar: Adobe PDF - {47833539-D0C5-4125-9FA8-0819E2EAAC93} - C:\Program Files\Adobe\Acrobat 6.0\Acrobat\AcroIEFavClient.dll 
O4 - HKLM\..\Run: [AVGCtrl] C:\Program Files\AVPersonal\AVGNT.EXE /min 
O4 - HKLM\..\Run: [PrevxHome] C:\Program Files\Prevx Home\SAGUI.exe 
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe 
O4 - Global Startup: PyGrenouille.lnk = C:\Program Files\PyGrenouille\pygrenouille.exe 
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~3\OFFICE11\EXCEL.EXE/3000 
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\j2re1.4.2_03\bin\npjpi142_03.dll 
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\j2re1.4.2_03\bin\npjpi142_03.dll 
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~3\OFFICE11\REFIEBAR.DLL 
O9 - Extra button: Real.com - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - C:\WINDOWS\system32\Shdocvw.dll 
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 
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/windowsupdate/...b?1130238952343 
O17 - HKLM\System\CCS\Services\Tcpip\..\{29CB944C-17CC-487D-8BFE-A0377C4F1027}: NameServer = 212.27.32.176,212.27.32.177 
O20 - Winlogon Notify: igfxcui - C:\WINDOWS\SYSTEM32\igfxdev.dll 
O23 - Service: AntiVir Service (AntiVirService) - H+BEDV Datentechnik GmbH - C:\PROGRAM FILES\AVPERSONAL\AVGUARD.EXE 
O23 - Service: AntiVir Update (AVWUpSrv) - H+BEDV Datentechnik GmbH, Germany - C:\Program Files\AVPersonal\AVWUPSRV.EXE 
O23 - Service: EpsonBidirectionalService - Unknown owner - C:\Program Files\Fichiers communs\EPSON\EBAPI\eEBSVC.exe 
O23 - Service: EPSON Printer Status Agent2 (EPSONStatusAgent2) - SEIKO EPSON CORPORATION - C:\Program Files\Fichiers communs\EPSON\EBAPI\SAgent2.exe 
O23 - Service: Prevx Agent (PrevxAgent) - Unknown owner - C:\Program Files\Prevx Home\PXAgent.exe" -f (file missing) 
O23 - Service: ScriptBlocking Service (SBService) - Symantec Corporation - C:\PROGRA~1\FICHIE~1\SYMANT~1\SCRIPT~1\SBServ.exe