CHEVAL DE TROIE A L'AIDE SVP

Bonjour,
Je tente de d�sinfecter mon PC depuis 5 jours en vain.
Mon antivirus AVAST Pro m�a alert�e de virus pr�sents dans mon ordinateur :
WIN32 : Trojan-gen (other) Virus ver
WIN32 : Adware-gen (adw) adware
WIN 32 : Agent LTS (trj) Cheval de Troie
WIN32 : adware- gen (adw) adware main uninstall

Cette alerte a �t� suivie du changement de param�tres de mon bureau, en effet mon fond d��cran habituel a �t� remplac� par un sigle genre t�te de mort sur fond rouge avec le message suivant � your privacy is in danger �.
D�s que je clique sur une ic�ne ou sur le bureau une page internet s�ouvre de mani�re intempestive, les sites sont toujours les m�mes :
Adwareremover 2007, DefenseNetSurfage ou mediasportal�tous me vantent les m�rites de leur antivirus.

Je suis all�e sur les archives d�un forum remontant de plusieurs mois et j�ai tent� de suivre leur conseils :
J�ai t�l�charg� le logiciel CLEANUP et j�ai lanc� un scan,
J�ai t�l�charg� le logiciel SPYBOT et j�ai lanc� un scan,
J�ai t�l�charg�le logiciel HIJACKTHIS et j�ai lanc� un scan dont voici le rapport :
Logfile of HijackThis v1.99.1
Scan saved at 11:09:40, on 26/10/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16544)

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:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
C:\Program Files\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Lavasoft\Ad-Aware 2007\aawservice.exe
C:\PROGRA~1\FICHIE~1\AOL\ACS\AOLacsd.exe
c:\APPS\Powercinema\Kernel\TV\CLCapSvc.exe
c:\APPS\Powercinema\Kernel\TV\CLSched.exe
C:\Program Files\CyberLink\Shared Files\CLML_NTService\CLMLServer.exe
C:\Program Files\CyberLink\Shared Files\CLML_NTService\CLMLService.exe
c:\APPS\HIDSERVICE\HIDSERVICE.exe
C:\Program Files\Fichiers communs\Microsoft Shared\VS7Debug\mdm.exe
C:\WINDOWS\system32\slserv.exe
C:\WINDOWS\System32\snmp.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
C:\Program Files\Alwil Software\Avast4\ashWebSv.exe
C:\WINDOWS\system32\VTTimer.exe
C:\WINDOWS\SOUNDMAN.EXE
C:\Program Files\Java\jre1.6.0_01\bin\jusched.exe
C:\Apps\Powercinema\PCMService.exe
C:\Program Files\Elaborate Bytes\VirtualCloneDrive\VCDDaemon.exe
C:\Program Files\Fichiers communs\Real\Update_OB\realsched.exe
C:\Program Files\QuickTime\qttask.exe
C:\WINDOWS\V0220Mon.exe
C:\Program Files\Creative\Creative Live! Cam\VideoFX\StartFX.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\Musicmatch\Musicmatch Jukebox\mm_tray.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Musicmatch\Musicmatch Jukebox\mmtask.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\WINDOWS\system32\regsvr32.exe
C:\Program Files\MSN Messenger\MsnMsgr.Exe
C:\Program Files\Creative\Creative Live! Cam\Live! Cam Manager\CTLCMgr.exe
C:\Program Files\SightSpeed\SightSpeed.exe
C:\Program Files\Fichiers communs\Ahead\lib\NMBgMonitor.exe
C:\Program Files\Fichiers communs\Ahead\Lib\NMIndexingService.exe
C:\Program Files\Fichiers communs\Ahead\Lib\NMIndexStoreSvr.exe
C:\WINDOWS\system32\ntvdm.exe
C:\Program Files\Java\jre1.6.0_01\bin\jucheck.exe
C:\Program Files\Microsoft Office\Office12\WINWORD.EXE
C:\WINDOWS\explorer.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Documents and Settings\Sandrine\Bureau\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.mon-accueil.com/76885-1191006889
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = https://www.msn.com/fr-fr/?ocid=iehp
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.msn.com/fr-fr/?ocid=iehp
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {0DF1CA3B-9BDA-D984-3B00-0B456557F41B} - C:\Program Files\xniufhhw\dhxxhufi.dll
O2 - BHO: MSVPS System - {480598DD-AE28-48B7-82F7-6ADDA1AA6B66} - C:\WINDOWS\ntspkfxt.dll
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_01\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Windows Live Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O3 - Toolbar: Easy-WebPrint - {327C2873-E90D-4c37-AA9D-10AC9BABA46C} - C:\Program Files\Canon\Easy-WebPrint\Toolband.dll
O3 - Toolbar: The htunistock - {C58A4487-4C2E-45E4-9E3A-52B3A23CC396} - C:\WINDOWS\htunistock.dll (file missing)
O4 - HKLM\..\Run: [IMJPMIG8.1] "C:\WINDOWS\IME\imjp8_1\IMJPMIG.EXE" /Spoil /RemAdvDef /Migration32
O4 - HKLM\..\Run: [PHIME2002ASync] C:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /SYNC
O4 - HKLM\..\Run: [PHIME2002A] C:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /IMEName
O4 - HKLM\..\Run: [VTTimer] VTTimer.exe
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_01\bin\jusched.exe"
O4 - HKLM\..\Run: [PCMService] "c:\Apps\Powercinema\PCMService.exe"
O4 - HKLM\..\Run: [VirtualCloneDrive] "C:\Program Files\Elaborate Bytes\VirtualCloneDrive\VCDDaemon.exe" /s
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Fichiers communs\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [V0220Mon.exe] C:\WINDOWS\V0220Mon.exe
O4 - HKLM\..\Run: [AVFX Engine] C:\Program Files\Creative\Creative Live! Cam\VideoFX\StartFX.exe
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [MMTray] "C:\Program Files\Musicmatch\Musicmatch Jukebox\mm_tray.exe"
O4 - HKLM\..\Run: [mmtask] "C:\Program Files\Musicmatch\Musicmatch Jukebox\mmtask.exe"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\Program Files\Fichiers communs\Ahead\Lib\NeroCheck.exe
O4 - HKLM\..\Run: [Adobe Photo Downloader] "C:\Program Files\Adobe\Photoshop Album Edition D�couverte\3.0\Apps\apdproxy.exe"
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [Device Detector] DevDetect.exe -autorun
O4 - HKLM\..\Run: [tchehczw] regsvr32 /u "C:\Documents and Settings\All Users\Application Data\tchehczw.dll"
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [WOOKIT] C:\PROGRA~1\Wanadoo\Shell.exe appLaunchClientZone.shl|DEFAULT=cnx|PARAM=
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [Creative Live! Cam Manager] "C:\Program Files\Creative\Creative Live! Cam\Live! Cam Manager\CTLCMgr.exe"
O4 - HKCU\..\Run: [SightSpeed] C:\Program Files\SightSpeed\SightSpeed.exe -minimized
O4 - HKCU\..\Run: [BgMonitor_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "C:\Program Files\Fichiers communs\Ahead\lib\NMBgMonitor.exe"
O4 - Global Startup: Lancement rapide d'Adobe Reader.lnk = C:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: Microsoft Office (2).lnk = C:\Program Files\microsoft office\Office\OSA9.EXE
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~3\Office12\EXCEL.EXE/3000
O8 - Extra context menu item: Easy-WebPrint Ajouter � la liste d'impressions - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_AddToList.html
O8 - Extra context menu item: Easy-WebPrint Impression rapide - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_HSPrint.html
O8 - Extra context menu item: Easy-WebPrint Imprimer - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_Print.html
O8 - Extra context menu item: Easy-WebPrint Pr�visualiser - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_Preview.html
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_01\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_01\bin\ssv.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~3\Office12\REFIEBAR.DLL
O9 - Extra button: Real.com - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - C:\WINDOWS\system32\Shdocvw.dll
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search & Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra button: Messager Wanadoo - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\PROGRA~1\WANADO~1\Wanadoo Messager.exe (file missing)
O9 - Extra 'Tools' menuitem: Messager Wanadoo - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\PROGRA~1\WANADO~1\Wanadoo Messager.exe (file missing)
O11 - Options group: [INTERNATIONAL] International*
O14 - IERESET.INF: START_PAGE_URL=file://C:\APPS\IE\offline\fr.htm
O16 - DPF: {4F1E5B1A-2A80-42CA-8532-2D05CB959537} (MSN Photo Upload Tool) - http://by109fd.bay109.hotmail.msn.com/resources/MsnPUpld.cab
O16 - DPF: {5D6F45B3-9043-443D-A792-115447494D24} (UnoCtrl Class) - http://messenger.zone.msn.com/FR-FR/a-UNO1/GAME_UNO1.cab
O16 - DPF: {C3F79A2B-B9B4-4A66-B012-3EE46475B072} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsPAClient.cab56907.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/swflash.cab
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: ms-help - {314111C7-A502-11D2-BBCA-00C04F8EC294} - C:\Program Files\Fichiers communs\Microsoft Shared\Help\hxds.dll
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Filter hijack: text/xml - {807563E5-5146-11D5-A672-00B0D022E945} - C:\PROGRA~1\FICHIE~1\MICROS~1\OFFICE12\MSOXMLMF.DLL
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - C:\WINDOWS\system32\WPDShServiceObj.dll
O21 - SSODL: hostctrl - {1FE7F66E-84D6-41F3-974C-CDD576878124} - C:\WINDOWS\hostctrl.dll
O21 - SSODL: hstsys - {A17C4EF3-88BD-4063-8D38-7F5E3784BE2A} - C:\WINDOWS\hstsys.dll (file missing)
O21 - SSODL: msmhost - {DD2476D3-90EA-4D62-941A-B1DBAA84C8B5} - C:\WINDOWS\msmhost.dll
O21 - SSODL: msmdev - {8182B586-4575-474E-8F2B-CC3C46933EDE} - C:\WINDOWS\msmdev.dll (file missing)
O23 - Service: Ad-Aware 2007 Service (aawservice) - Lavasoft AB - C:\Program Files\Lavasoft\Ad-Aware 2007\aawservice.exe
O23 - Service: AOL Connectivity Service (AOL ACS) - America Online, Inc. - C:\PROGRA~1\FICHIE~1\AOL\ACS\AOLacsd.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - ALWIL Software - C:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashWebSv.exe" /service (file missing)
O23 - Service: CyberLink Background Capture Service (CBCS) (CLCapSvc) - Unknown owner - c:\APPS\Powercinema\Kernel\TV\CLCapSvc.exe
O23 - Service: CyberLink Task Scheduler (CTS) (CLSched) - Unknown owner - c:\APPS\Powercinema\Kernel\TV\CLSched.exe
O23 - Service: CyberLink Media Library Service - Cyberlink - C:\Program Files\CyberLink\Shared Files\CLML_NTService\CLMLServer.exe
O23 - Service: Generic Service for HID Keyboard Input Collections (GenericHidService) - Unknown owner - c:\APPS\HIDSERVICE\HIDSERVICE.exe
O23 - Service: Service de l'iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: MysqlInventime - Unknown owner - c:\mysql\bin\mysqld-nt.exe
O23 - Service: NMIndexingService - Nero AG - C:\Program Files\Fichiers communs\Ahead\Lib\NMIndexingService.exe
O23 - Service: SmartLinkService (SLService) - - C:\WINDOWS\SYSTEM32\slserv.exe

Je suis all� sur le site de BITDEFENDER et j�ai lanc� un scan online dont voila le rapport :
BitDefender Online Scanner
Scan report generated at: Fri, Oct 26, 2007 - 12:43:48

Scan path: C:\;D:\;E:\;F:\;G:\;H:\;I:\;

Statistics
Time 01:24:14
Files 236540
Folders 6909
Boot Sectors 3
Archives 9504
Packed Files 11072

Results
Identified Viruses 3
Infected Files 5
Suspect Files 0
Warnings 0
Disinfected 0
Deleted Files 4

Engines Info
Virus Definitions 858140
Engine build AVCORE v1.0 (build 2422) (i386) (Sep 25 2007 08:26:36)
Scan plugins 14
Archive plugins 38
Unpack plugins 7
E-mail plugins 6
System plugins 1

Scan Settings
First Action Disinfect
Second Action Delete
Heuristics Yes
Enable Warnings Yes
Scanned Extensions *;
Exclude Extensions
Scan Emails Yes
Scan Archives Yes
Scan Packed Yes
Scan Files Yes
Scan Boot Yes

Scanned File Status
C:\System Volume Information\_restore{751238CC-FEB5-4605-9EA9-B441EBD3D66D}\RP507\A0068922.exe Detected with: Adware.Navipromo.BYT
C:\System Volume Information\_restore{751238CC-FEB5-4605-9EA9-B441EBD3D66D}\RP507\A0068922.exe Disinfection failed
C:\System Volume Information\_restore{751238CC-FEB5-4605-9EA9-B441EBD3D66D}\RP507\A0068922.exe Deleted
C:\System Volume Information\_restore{751238CC-FEB5-4605-9EA9-B441EBD3D66D}\RP524\A0070561.exe Detected with: Adware.Navipromo.BYT
C:\System Volume Information\_restore{751238CC-FEB5-4605-9EA9-B441EBD3D66D}\RP524\A0070561.exe Disinfection failed
C:\System Volume Information\_restore{751238CC-FEB5-4605-9EA9-B441EBD3D66D}\RP524\A0070561.exe Deleted
C:\System Volume Information\_restore{751238CC-FEB5-4605-9EA9-B441EBD3D66D}\RP528\A0070888.exe Infected with: Dropped:Trojan.Downloader.Zlob.AAWH
C:\System Volume Information\_restore{751238CC-FEB5-4605-9EA9-B441EBD3D66D}\RP528\A0070888.exe Disinfection failed
C:\System Volume Information\_restore{751238CC-FEB5-4605-9EA9-B441EBD3D66D}\RP528\A0070888.exe Deleted
C:\System Volume Information\_restore{751238CC-FEB5-4605-9EA9-B441EBD3D66D}\RP534\A0071215.dll Infected with: Trojan.Agent.BHO.O
C:\System Volume Information\_restore{751238CC-FEB5-4605-9EA9-B441EBD3D66D}\RP534\A0071215.dll Disinfection failed
C:\System Volume Information\_restore{751238CC-FEB5-4605-9EA9-B441EBD3D66D}\RP534\A0071215.dll Deleted
C:\WINDOWS\msmhost.dll Infected with: Trojan.Agent.BHO.O
C:\WINDOWS\msmhost.dll Disinfection failed
C:\WINDOWS\msmhost.dll Delete failed

On me conseillait de t�l�charger le logiciel de Lavasoft Ad-aware et Ad �watch 2007, je n�ai jamais r�ussi � les utiliser et n�ai trouv� aucun conseils � ce sujet, j�ai donc d�sinstaller ces logiciels non sans mal.
Merci d�avance de m�aider, je vais devenir folle�et je n�y comprends rien.
Sandrine