Affichage incessant de pages de pub

Bonjour Je suis envahi presque à chaque ouverture de page par un affichage intempestif de pages de pub ( voyance, téléphonie mobile, site de VPC...). Je commence à ne plus rien y comprendre : j'ai scanné à maintes reprises mon ordi avec AVG, a-sqared, Ad-Aware, Spybot et Avast ; j'ai toujours les mêmes problèmes, celà est récurant , je suis sur la dernière version de Mozilla . Pouvez-vous m'aider ? Je vous en remercie par avance. je joints le rapport Hitjackthis : Logfile of HijackThis v1.99.1
Scan saved at 11:43:03, on 22/07/2007
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\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:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
C:\Program Files\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\PROGRA~1\Grisoft\AVG7\avgcc.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Program Files\Netropa\Multimedia Keyboard\MMKeybd.exe
C:\WINDOWS\SOUNDMAN.EXE
C:\WINDOWS\ALCWZRD.EXE
C:\WINDOWS\ALCMTR.EXE
C:\Program Files\Siber Systems\AI RoboForm\RoboTaskBarIcon.exe
C:\Program Files\Macrogaming\SweetIM\SweetIM.exe
C:\Program Files\Netropa\Multimedia Keyboard\TrayMon.exe
C:\Program Files\Netropa\Onscreen Display\OSD.exe
C:\Program Files\Netropa\InetKb\Inetkb.exe
C:\Program Files\Netropa\Multimedia Keyboard\nhksrv.exe
C:\Program Files\a-squared Anti-Malware\a2service.exe
C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
C:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
C:\PROGRA~1\Grisoft\AVG7\avgemc.exe
C:\WINDOWS\system32\HPZipm12.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\wdfmgr.exe
C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
C:\Program Files\Alwil Software\Avast4\ashWebSv.exe
C:\WINDOWS\System32\alg.exe
C:\Program Files\a-squared Anti-Malware\a2guard.exe
c:\program files\a-squared free\a2service.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\Hijackthis Version Française\VERSION TRADUITE ORIGINALE.EXE

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://runonce.msn.com/?v=msgrv75
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = https://home.sweetim.com/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
R3 - URLSearchHook: SweetIM For Internet Explorer - {BC4FFE41-DE9F-46fa-B455-AAD49B9F9938} - C:\Program Files\Macrogaming\SweetIMBarForIE\toolbar.dll (file missing)
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: SWEETIE Class - {1A0AADCD-3A72-4b5f-900F-E3BB5A838E2A} - C:\PROGRA~1\MACROG~1\SWEETI~1\toolbar.dll (file missing)
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - D:\SPYBOT~1\SDHelper.dll
O2 - BHO: (no name) - {724d43a9-0d85-11d4-9908-00400523e39a} - C:\Program Files\Siber Systems\AI RoboForm\roboform.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
O2 - BHO: (no name) - {FFFFFEF0-5B30-21D4-945D-000000000000} - C:\PROGRA~1\STARDO~1\SDIEInt.dll
O3 - Toolbar: &RoboForm - {724d43a0-0d85-11d4-9908-00400523e39a} - C:\Program Files\Siber Systems\AI RoboForm\roboform.dll
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\Grisoft\AVG7\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [MULTIMEDIA KEYBOARD] C:\Program Files\Netropa\Multimedia Keyboard\MMKeybd.exe
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [AlcWzrd] ALCWZRD.EXE
O4 - HKLM\..\Run: [Alcmtr] ALCMTR.EXE
O4 - HKLM\..\Run: [a-squared] "C:\Program Files\a-squared Anti-Malware\a2guard.exe"
O4 - HKCU\..\Run: [RoboForm] "C:\Program Files\Siber Systems\AI RoboForm\RoboTaskBarIcon.exe"
O4 - HKCU\..\Run: [SweetIM] C:\Program Files\Macrogaming\SweetIM\SweetIM.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [HijackThis startup scan] C:\Program Files\Hijackthis Version Française\HijackThis.exe /startupscan

O8 - Extra context menu item: &Search - http://edits.mywebsearch.com/toolbaredits/menusearch.jhtml?p=ZNfox000
O8 - Extra context menu item: Barre RoboForm - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComShowToolbar.html
O8 - Extra context menu item: Cartes - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComEditPass.html
O8 - Extra context menu item: Déconnexion - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComLogoff.html
O8 - Extra context menu item: Enregistrer le formulaire - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComSavePass.html
O8 - Extra context menu item: Générateur - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComPasswordGenerator.html
O8 - Extra context menu item: Icône de la BT - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComTaskBarIcon.html
O8 - Extra context menu item: Identités - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComEditIdent.html
O8 - Extra context menu item: Initialiser - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComSetFields.html
O8 - Extra context menu item: Notes Sécurisées - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComEditNote.html
O8 - Extra context menu item: Options RoboForm - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComOptions.html
O8 - Extra context menu item: Personnaliser le menu - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComCustomizeIEMenu.html
O8 - Extra context menu item: Remplir le formulaire - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComFillForms.html
O8 - Extra context menu item: Réinitialiser - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComResetFields.html
O8 - Extra context menu item: Télécharger avec Star Downloader - C:\Program Files\Star Downloader\sdie.htm
O8 - Extra context menu item: Vider les champs - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComClearFields.html
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0\bin\npjpi150.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0\bin\npjpi150.dll
O9 - Extra button: Remplir - {320AF880-6646-11D3-ABEE-C5DBF3571F46} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComFillForms.html
O9 - Extra 'Tools' menuitem: Remplir le formulaire - {320AF880-6646-11D3-ABEE-C5DBF3571F46} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComFillForms.html
O9 - Extra button: Enregistrer - {320AF880-6646-11D3-ABEE-C5DBF3571F49} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComSavePass.html
O9 - Extra 'Tools' menuitem: Enregistrer le formulaire - {320AF880-6646-11D3-ABEE-C5DBF3571F49} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComSavePass.html
O9 - Extra button: Options - {320AF880-6646-11D3-ABEE-C5DBF3571F4C} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComOptions.html
O9 - Extra 'Tools' menuitem: Options RoboForm - {320AF880-6646-11D3-ABEE-C5DBF3571F4C} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComOptions.html
O9 - Extra button: Personnaliser - {320AF880-6646-11D3-ABEE-C5DBF3571F4E} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComCustomizeIEMenu.html
O9 - Extra 'Tools' menuitem: Personnaliser le menu - {320AF880-6646-11D3-ABEE-C5DBF3571F4E} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComCustomizeIEMenu.html
O9 - Extra button: Générateur - {320AF880-6646-11D3-ABEE-C5DBF3571F50} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComPasswordGenerator.html
O9 - Extra 'Tools' menuitem: Générateur - {320AF880-6646-11D3-ABEE-C5DBF3571F50} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComPasswordGenerator.html
O9 - Extra button: Icône de la BT - {320AF880-6646-11D3-ABEE-C5DBF3571F51} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComTaskBarIcon.html
O9 - Extra 'Tools' menuitem: Icône de la BT - {320AF880-6646-11D3-ABEE-C5DBF3571F51} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComTaskBarIcon.html
O9 - Extra button: Initialiser - {320AF880-6646-11D3-ABEE-C5DBF3571F52} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComSetFields.html
O9 - Extra 'Tools' menuitem: Initialiser - {320AF880-6646-11D3-ABEE-C5DBF3571F52} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComSetFields.html
O9 - Extra button: Réinitialiser - {320AF880-6646-11D3-ABEE-C5DBF3571F53} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComResetFields.html
O9 - Extra 'Tools' menuitem: Réinitialiser - {320AF880-6646-11D3-ABEE-C5DBF3571F53} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComResetFields.html
O9 - Extra button: Vider - {320AF880-6646-11D3-ABEE-C5DBF3571F54} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComClearFields.html
O9 - Extra 'Tools' menuitem: Vider les champs - {320AF880-6646-11D3-ABEE-C5DBF3571F54} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComClearFields.html
O9 - Extra button: Déconnexion - {320AF880-6646-11D3-ABEE-C5DBF3571F55} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComLogoff.html
O9 - Extra 'Tools' menuitem: Déconnexion - {320AF880-6646-11D3-ABEE-C5DBF3571F55} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComLogoff.html
O9 - Extra button: Identités - {45DB34C3-955C-11D3-ABEF-444553540000} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComEditIdent.html
O9 - Extra 'Tools' menuitem: Identités - {45DB34C3-955C-11D3-ABEF-444553540000} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComEditIdent.html
O9 - Extra button: Cartes - {45DB34C3-955C-11D3-ABEF-444553540001} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComEditPass.html
O9 - Extra 'Tools' menuitem: Cartes - {45DB34C3-955C-11D3-ABEF-444553540001} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComEditPass.html
O9 - Extra button: Notes Sécurisées - {45DB34C3-955C-11D3-ABEF-444553540002} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComEditNote.html
O9 - Extra 'Tools' menuitem: Notes Sécurisées - {45DB34C3-955C-11D3-ABEF-444553540002} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComEditNote.html
O9 - Extra button: Barre RoboForm - {724d43aa-0d85-11d4-9908-00400523e39a} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComShowToolbar.html
O9 - Extra 'Tools' menuitem: Barre RoboForm - {724d43aa-0d85-11d4-9908-00400523e39a} - file://C:\Program Files\Siber Systems\AI RoboForm\RoboFormComShowToolbar.html
O9 - Extra button: (no name) - {B205A35E-1FC4-4CE3-818B-899DBBB3388C} - C:\Program Files\Fichiers communs\Microsoft Shared\Encarta Search Bar\ENCSBAR.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: {C3F79A2B-B9B4-4A66-B012-3EE46475B072} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsPAClient.cab56907.cab
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FICHIE~1\Skype\SKYPE4~1.DLL
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O23 - Service: a-squared Anti-Malware Service (a2AntiMalware) - Emsi Software GmbH - C:\Program Files\a-squared Anti-Malware\a2service.exe
O23 - Service: a-squared Free Service (a2free) - Emsi Software GmbH - c:\program files\a-squared free\a2service.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: AVG Anti-Spyware Guard - GRISOFT s.r.o. - C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
O23 - Service: AVG E-mail Scanner (AVGEMS) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgemc.exe
O23 - Service: Netropa NHK Server (nhksrv) - Unknown owner - C:\Program Files\Netropa\Multimedia Keyboard\nhksrv.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\system32\HPZipm12.exe