Spyware trojandownloader? + log Hijackthis

Bonjour,

Depuis quelques temps j'ai des messages systemes me signalant que mon pc est infeste par des spyware + mon fond d'ecran qui est tout bleu et qui dit la meme chose. Quand je clic sur les liens cela m'encourage a achete un anti spyware.
A la lecture de votre forum j'ai l'impression que cela correspond au spyware trojandownloader .
J'ai effectue un scan hijackthis que voici

Pouvez-vous m'indiquer la marche a suivre pour me debarasser des spyware presents sur la machine.
Merci

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 14:51:11, on 14/05/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16640)
Boot mode: Normal

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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\system32\wmsdkns.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Fichiers communs\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
C:\Program Files\Fichiers communs\LightScribe\LSSrvc.exe
C:\Program Files\Fichiers communs\Microsoft Shared\VS7Debug\mdm.exe
C:\WINDOWS\winself.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\wscntfy.exe
C:\Program Files\Java\jre1.6.0_05\bin\jusched.exe
C:\Program Files\Winamp\winampa.exe
C:\Program Files\QuickTime\QTTask.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
C:\Program Files\MSN Messenger\MsnMsgr.Exe
C:\Program Files\DAEMON Tools Lite\daemon.exe
C:\Program Files\Hewlett-Packard\AiO\hp psc 700 series\Bin\hpobrt07.exe
C:\Program Files\Panasonic\LUMIXSimpleViewer\PhLeAutoRun.exe
C:\Program Files\Nikon\PictureProject\NkbMonitor.exe
C:\PROGRA~1\HEWLET~1\AiO\Shared\Bin\hpoevm07.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\Program Files\Hewlett-Packard\AiO\Shared\bin\hpOSTS07.exe
C:\WINDOWS\system32\devldr32.exe
C:\Program Files\MSN Messenger\usnsvc.exe
C:\Program Files\eMule\emule.exe
C:\Program Files\Azureus\Azureus.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.google.fr/?gws_rd=ssl
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
F2 - REG:system.ini: UserInit=C:\WINDOWS\system32\userinit.exe,C:\WINDOWS\system32\wmsdkns.exe,
O2 - BHO: (no name) - {00000250-0320-4dd4-be4f-7566d2314352} - (no file)
O2 - BHO: (no name) - {13197ace-6851-45c3-a7ff-c281324d5489} - (no file)
O2 - BHO: (no name) - {15651c7c-e812-44a2-a9ac-b467a2233e7d} - (no file)
O2 - BHO: (no name) - {4e1075f4-eec4-4a86-add7-cd5f52858c31} - (no file)
O2 - BHO: (no name) - {4e7bd74f-2b8d-469e-92c6-ce7eb590a94d} - (no file)
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: (no name) - {5929cd6e-2062-44a4-b2c5-2c7e78fbab38} - (no file)
O2 - BHO: (no name) - {5dafd089-24b1-4c5e-bd42-8ca72550717b} - (no file)
O2 - BHO: (no name) - {5fa6752a-c4a0-4222-88c2-928ae5ab4966} - (no file)
O2 - BHO: (no name) - {622cc208-b014-4fe0-801b-874a5e5e403a} - (no file)
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_05\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: (no name) - {8674aea0-9d3d-11d9-99dc-00600f9a01f1} - (no file)
O2 - BHO: (no name) - {965a592f-8efa-4250-8630-7960230792f1} - (no file)
O2 - BHO: (no name) - {9c5b2f29-1f46-4639-a6b4-828942301d3e} - (no file)
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar2.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files\Google\GoogleToolbarNotifier\2.0.301.7164\swg.dll
O2 - BHO: (no name) - {cf021f40-3e14-23a5-cba2-717765728274} - (no file)
O2 - BHO: (no name) - {fc3a74e5-f281-4f10-ae1e-733078684f3c} - (no file)
O2 - BHO: (no name) - {ffff0001-0002-101a-a3c9-08002b2f49fb} - (no file)
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar2.dll
O4 - HKLM\..\Run: [StartCCC] "C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\CLIStart.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_05\bin\jusched.exe"
O4 - HKLM\..\Run: [CatalystRegistration] "C:\Program Files\ATI\CatalystRegistration\dolce.exe"
O4 - HKLM\..\Run: [WinampAgent] "C:\Program Files\Winamp\winampa.exe"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files\Adobe\Reader 8.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\QTTask.exe" -atboottime
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKLM\..\RunOnce: [SpybotSnD] "C:\Program Files\Spybot - Search & Destroy\SpybotSD.exe" /autocheck
O4 - HKLM\..\RunOnce: [SpybotDeletingA5724] command /c del "C:\Program Files\webHancer\Programs\sporder.dll"
O4 - HKLM\..\RunOnce: [SpybotDeletingC4448] cmd /c del "C:\Program Files\webHancer\Programs\sporder.dll"
O4 - HKLM\..\RunOnce: [SpybotDeletingA5930] command /c del "C:\Program Files\webHancer\Programs\readme.txt"
O4 - HKLM\..\RunOnce: [SpybotDeletingC3582] cmd /c del "C:\Program Files\webHancer\Programs\readme.txt"
O4 - HKLM\..\RunOnce: [SpybotDeletingA6231] command /c del "C:\Program Files\webHancer\Programs\whagent.exe"
O4 - HKLM\..\RunOnce: [SpybotDeletingC2277] cmd /c del "C:\Program Files\webHancer\Programs\whagent.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [SpybotSD TeaTimer] C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
O4 - HKCU\..\Run: [swg] C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [DAEMON Tools Lite] "C:\Program Files\DAEMON Tools Lite\daemon.exe"
O4 - HKCU\..\RunOnce: [SpybotDeletingD6685] cmd /c del "C:\Program Files\webHancer\Programs\sporder.dll"
O4 - HKCU\..\RunOnce: [SpybotDeletingB3839] command /c del "C:\Program Files\webHancer\Programs\readme.txt"
O4 - HKCU\..\RunOnce: [SpybotDeletingD6059] cmd /c del "C:\Program Files\webHancer\Programs\readme.txt"
O4 - HKCU\..\RunOnce: [SpybotDeletingB5108] command /c del "C:\Program Files\webHancer\Programs\whagent.exe"
O4 - HKCU\..\RunOnce: [SpybotDeletingD8856] cmd /c del "C:\Program Files\webHancer\Programs\whagent.exe"
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program Files\Fichiers communs\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: HPAiODevice(hp psc 700 series) - 1.lnk = C:\Program Files\Hewlett-Packard\AiO\hp psc 700 series\Bin\hpobrt07.exe
O4 - Global Startup: LUMIX Simple Viewer.lnk = ?
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: NkbMonitor.exe.lnk = C:\Program Files\Nikon\PictureProject\NkbMonitor.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_05\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_05\bin\ssv.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} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O10 - Hijacked Internet access by WebHancer
O10 - Hijacked Internet access by WebHancer
O10 - Hijacked Internet access by WebHancer
O16 - DPF: {2D8ED06D-3C30-438B-96AE-4D110FDC1FB8} (ActiveScan 2.0 Installer Class) - http://acs.pandasoftware.com/activescan/cabs/as2stubie.cab
O16 - DPF: {54BE6B6F-3056-470B-97E1-BB92E051B6C4} (DeviceEnum Class) - http://h20264.www2.hp.com/ediags/dd/install/HPDriverDiagnosticsxp2k.cab
O16 - DPF: {CE3409C4-9E26-4F8E-83E4-778498F9E7B4} (PB_Uploader Class) - http://www.photoways.com/clients/uploader_v2.2.0.6.cab
O16 - DPF: {CF40ACC5-E1BB-4AFF-AC72-04C2F616BCA7} -
O23 - Service: Apple Mobile Device - Apple, Inc. - C:\Program Files\Fichiers communs\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: Service de l'iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Hewlett-Packard Company - C:\Program Files\Fichiers communs\LightScribe\LSSrvc.exe
O23 - Service: MsSecurity Updated (MsSecurity1.209.4) - Unknown owner - C:\WINDOWS\winself.exe