Rien ne marche pour supprimer un troyen Downl

Salut (ou re) à tous. Je suis sous windows xp avec avg plus firewall comme antivirus et j'ai depuis hier matin un troyen, a priori nommé Downloader, et pas moyen de le virer : ni l'antivirus, ni adaware, ni trojan remover. Quelqu'un peut-il m'aider ?
Voilà le log de HijackThis :

Logfile of HijackThis v1.99.1
Scan saved at 08:02:13, on 03/11/2005
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)

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:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
C:\PROGRA~1\Grisoft\AVG7\avgemc.exe
C:\PROGRA~1\Grisoft\AVG7\avgfwsrv.exe
C:\WINDOWS\System32\drivers\CDAC11BA.EXE
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Creative\BlasterControl\Blstapp.exe
C:\WINDOWS\htpatch.exe
C:\WINDOWS\System32\RunDll32.exe
C:\Program Files\ScanSoft\OmniPageSE2.0\OpwareSE2.exe
C:\Program Files\Alcatel\SpeedTouch USB\Dragdiag.exe
C:\Program Files\Fichiers communs\Logitech\QCDriver2\LVCOMS.EXE
C:\Program Files\Fichiers communs\Real\Update_OB\realsched.exe
C:\Program Files\QuickTime\qttask.exe
C:\PROGRA~1\Grisoft\AVG7\avgcc.exe
C:\WINDOWS\System32\ctfmon.exe
C:\Program Files\Nikon\PictureProject\NkbMonitor.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\PROGRA~1\Grisoft\AVG7\avgw.exe
C:\Documents and Settings\Vincent\Mes documents\Vincent\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.wanadoo.fr/
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.wanadoo.fr
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar1.dll
O2 - BHO: (no name) - {daa873d4-958c-453c-81ca-3fe6f3676a87} - C:\WINDOWS\System32:eoaa.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar1.dll
O4 - HKLM\..\Run: [BCMHal] rundll32.exe bcmhalnt.dll,BCInit
O4 - HKLM\..\Run: [BLSTAPP] "C:\Program Files\Creative\BlasterControl\Blstapp.exe"
O4 - HKLM\..\Run: [BCTWEAK] C:\Program Files\Creative\BlasterControl\BCTweak.exe -1
O4 - HKLM\..\Run: [HTpatch] C:\WINDOWS\htpatch.exe
O4 - HKLM\..\Run: [SiSUSBRG] C:\WINDOWS\SiSUSBrg.exe
O4 - HKLM\..\Run: [Cmaudio] RunDll32 cmicnfg.cpl,CMICtrlWnd
O4 - HKLM\..\Run: [Microsoft Corp Updates] wupdates.exe
O4 - HKLM\..\Run: [OpwareSE2] "C:\Program Files\ScanSoft\OmniPageSE2.0\OpwareSE2.exe"
O4 - HKLM\..\Run: [SpeedTouch USB Diagnostics] "C:\Program Files\Alcatel\SpeedTouch USB\Dragdiag.exe" /icon
O4 - HKLM\..\Run: [LVCOMS] C:\Program Files\Fichiers communs\Logitech\QCDriver2\LVCOMS.EXE
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: [AVG7_CC] C:\PROGRA~1\Grisoft\AVG7\avgcc.exe /STARTUP
O4 - HKLM\..\RunServices: [Microsoft Corp Updates] wupdates.exe
O4 - HKLM\..\RunServices: [Microsoft Standard Executions Library] win32lib.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\ctfmon.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office\OSA9.EXE
O4 - Global Startup: NkbMonitor.exe.lnk = C:\Program Files\Nikon\PictureProject\NkbMonitor.exe
O9 - Extra button: (no name) - {85d1f590-48f4-11d9-9669-0800200c9a66} - %windir%\bdoscandel.exe (file missing)
O9 - Extra 'Tools' menuitem: Uninstall BitDefender Online Scanner v8 - {85d1f590-48f4-11d9-9669-0800200c9a66} - %windir%\bdoscandel.exe (file missing)
O9 - Extra button: (no name) - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - (no file)
O10 - Unknown file in Winsock LSP: c:\windows\system32\avgfwafu.dll
O10 - Unknown file in Winsock LSP: c:\windows\system32\avgfwafu.dll
O10 - Unknown file in Winsock LSP: c:\windows\system32\avgfwafu.dll
O10 - Unknown file in Winsock LSP: c:\windows\system32\avgfwafu.dll
O10 - Unknown file in Winsock LSP: c:\windows\system32\avgfwafu.dll
O10 - Unknown file in Winsock LSP: c:\windows\system32\avgfwafu.dll
O15 - Trusted Zone: http://awbeta.net-nucleus.com (HKLM)
O16 - DPF: {10000000-1000-0000-0000-000000000000} - file://C:\\Recycler\\Q678341.exe
O16 - DPF: {205FF73B-CA67-11D5-99DD-444553540017} (CInstall Class) - http://www.videossimo.com/beta/1.3/p/cab/Install.cab
O16 - DPF: {30528230-99F7-4BB4-88D8-FA1D4F56A2AB} (YInstStarter Class) - http://us.dl1.yimg.com/download.yahoo.com/dl/yinst/yinst_current.cab
O16 - DPF: {33331111-1111-1111-1111-611111193457} - file://c:\ex.cab
O16 - DPF: {33331111-1111-1111-1111-611111193458} - file://c:\ex.cab
O16 - DPF: {33331111-1111-1111-1111-622221193458} - file://c:\ex.cab
O16 - DPF: {56336BCB-3D8A-11D6-A00B-0050DA18DE71} (RdxIE Class) - http://software-dl.real.com/234345b5b6c10102fa20/netzip/RdxIE601_fr.cab
O16 - DPF: {5D86DDB5-BDF9-441B-9E9E-D4730F4EE499} (BDSCANONLINE Control) - http://download.bitdefender.com/resources/scan8/oscan8.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/windowsupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1129572297622
O16 - DPF: {64311111-1111-1121-1111-111191113457} - file://c:\eied_s7.cab
O16 - DPF: {86A88967-7A20-11D2-8EDA-00600818EDB1} (ParallelGraphics Cortona Control) - http://www.parallelgraphics.com/bin/cortvrml.cab
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/MsnMessengerSetupDownloader.cab
O16 - DPF: {CE69F98F-2AF3-4306-BAC6-A79070EDA1B4} (Zylom Loader Object) - http://eu.download.games.yahoo.com/zylom/activex/zylomloader.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{0C273EF8-CD41-41B2-9B4C-3521E8ED7655}: NameServer = 80.10.246.130 80.10.246.3
O17 - HKLM\System\CS1\Services\Tcpip\..\{0C273EF8-CD41-41B2-9B4C-3521E8ED7655}: NameServer = 80.10.246.130 80.10.246.3
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - "C:\PROGRA~1\MSNMES~1\msgrapp.dll" (file missing)
O21 - SSODL: SystemCheck2 - {54645654-2225-4455-44A1-9F4543D34546} - C:\WINDOWS\System32\vbsys2.dll
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: AVG Firewall (AVGFwSrv) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgfwsrv.exe
O23 - Service: Boonty Games - BOONTY - C:\Program Files\Fichiers communs\BOONTY Shared\Service\Boonty.exe
O23 - Service: C-DillaCdaC11BA - Macrovision - C:\WINDOWS\System32\drivers\CDAC11BA.EXE
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Fichiers communs\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Windows System Service Framework (WSSF) - Unknown owner - C:\WINDOWS\alg.exe (file missing)