Probleme pop up spyware secure

Bonjour,

Je suis depuis quelques temps envahi de pop up agréssif spyware secure. Pourriez vous m'aider.
Voici le log hijack

Logfile of HijackThis v1.99.1
Scan saved at 18:35:31, on 12/01/2008
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

Running processes:
H:\WINDOWS\System32\smss.exe
H:\WINDOWS\system32\winlogon.exe
H:\WINDOWS\system32\services.exe
H:\WINDOWS\system32\lsass.exe
H:\WINDOWS\system32\svchost.exe
H:\WINDOWS\System32\svchost.exe
H:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
H:\Program Files\Alwil Software\Avast4\ashServ.exe
H:\WINDOWS\system32\LEXBCES.EXE
H:\WINDOWS\system32\spoolsv.exe
H:\WINDOWS\system32\LEXPPS.EXE
H:\WINDOWS\SYSTEM32\GEARSEC.EXE
H:\WINDOWS\System32\nvsvc32.exe
H:\WINDOWS\System32\svchost.exe
H:\Program Files\Alwil Software\Avast4\ashWebSv.exe
H:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
H:\WINDOWS\Explorer.EXE
H:\WINDOWS\RTHDCPL.EXE
H:\Program Files\Lexmark X1100 Series\lxbkbmgr.exe
H:\WINDOWS\System32\RUNDLL32.EXE
H:\Program Files\DAEMON Tools\daemon.exe
H:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
H:\Program Files\Java\jre1.6.0_03\bin\jusched.exe
H:\Program Files\MSN Messenger\MsnMsgr.Exe
H:\Program Files\Lexmark X1100 Series\lxbkbmon.exe
H:\Program Files\Steam\Steam.exe
H:\WINDOWS\System32\rundll32.exe
H:\Program Files\WinZip\WZQKPICK.EXE
H:\Program Files\MSN Messenger\usnsvc.exe
H:\Program Files\Mozilla Firefox\firefox.exe
H:\Documents and Settings\Nikolas\Bureau\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = https://www.bing.com/?FORM=TOOLBR&cc=fr&toHttps=1&redig=4527FFF1C12746FC9EDB535C75E80ECC
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = https://www.bing.com/?FORM=TOOLBR&cc=fr&toHttps=1&redig=4527FFF1C12746FC9EDB535C75E80ECC
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.google.fr/?gws_rd=ssl
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = https://www.bing.com/?FORM=TOOLBR&cc=fr&toHttps=1&redig=4527FFF1C12746FC9EDB535C75E80ECC
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - H:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - H:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - H:\Program Files\Java\jre1.6.0_03\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} - H:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Windows Live Toolbar Helper - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - H:\Program Files\Windows Live Toolbar\msntb.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - H:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: Windows Live Toolbar - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - H:\Program Files\Windows Live Toolbar\msntb.dll
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE H:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [SkyTel] SkyTel.EXE
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [Alcmtr] ALCMTR.EXE
O4 - HKLM\..\Run: [Lexmark X1100 Series] "H:\Program Files\Lexmark X1100 Series\lxbkbmgr.exe"
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE H:\WINDOWS\System32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [DAEMON Tools] "H:\Program Files\DAEMON Tools\daemon.exe" -lang 1033
O4 - HKLM\..\Run: [NeroFilterCheck] H:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [avast!] H:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "H:\Program Files\Java\jre1.6.0_03\bin\jusched.exe"
O4 - HKCU\..\Run: [MsnMsgr] "H:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [Steam] "H:\Program Files\Steam\Steam.exe" -silent
O4 - HKCU\..\Run: [updateMgr] H:\Program Files\Adobe\Acrobat 7.0\Reader\AdobeUpdateManager.exe AcRdB7_0_9
O4 - Global Startup: Lancement rapide d'Adobe Reader.lnk = H:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: Microsoft Office.lnk = H:\Program Files\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: WinZip Quick Pick.lnk = H:\Program Files\WinZip\WZQKPICK.EXE
O8 - Extra context menu item: &Windows Live Search - res://H:\Program Files\Windows Live Toolbar\msntb.dll/search.htm
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - H:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - H:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra button: Related - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - H:\WINDOWS\web\related.htm (file missing)
O9 - Extra 'Tools' menuitem: Show &Related Links - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - H:\WINDOWS\web\related.htm (file missing)
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - H:\Program Files\Messenger\MSMSGS.EXE
O9 - Extra 'Tools' menuitem: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - H:\Program Files\Messenger\MSMSGS.EXE
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
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - H:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - H:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - H:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - ALWIL Software - H:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - H:\Program Files\Alwil Software\Avast4\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - H:\Program Files\Alwil Software\Avast4\ashWebSv.exe" /service (file missing)
O23 - Service: GEARSecurity - GEAR Software - H:\WINDOWS\SYSTEM32\GEARSEC.EXE
O23 - Service: LexBce Server (LexBceS) - Lexmark International, Inc. - H:\WINDOWS\system32\LEXBCES.EXE
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - H:\WINDOWS\System32\nvsvc32.exe

Merci d'avance

Configuration: Windows XP
Firefox 2.0.0.11