About:blank + trojan horse (startpage et down

Bonjour,
J'ai besoin d'aide, mon PC est infecté et je n'arrive pas en m'en défaire.
J'ai fait un scan avec Adaware et Spyboot + un clean up
Merci de bien vouloir m'aider

Logfile of HijackThis v1.99.1
Scan saved at 16:12:28, on 19/05/2005
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

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\AVGFRE~1\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\SYSTEM32\USRmlnkA.exe
C:\WINDOWS\System32\RunDll32.exe
C:\Program Files\Roxio\Easy CD Creator 5\DirectCD\DirectCD.exe
C:\WINDOWS\SYSTEM32\USRshutA.exe
C:\WINDOWS\SYSTEM32\USRmlnkA.exe
C:\Program Files\Hewlett-Packard\HP Share-to-Web\hpgs2wnd.exe
C:\WINDOWS\System32\GSICON.EXE
C:\WINDOWS\System32\dslagent.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe
C:\PROGRA~1\Grisoft\AVGFRE~1\avgemc.exe
C:\WINDOWS\system32\ipdm32.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\Hewlett-Packard\HP Share-to-Web\hpgs2wnf.exe
C:\Program Files\interMute\SpySubtract\SpySub.exe
C:\WINDOWS\System32\wuauclt.exe
C:\Program Files\Outlook Express\msimn.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Documents and Settings\greisch\Local Settings\Temp\Répertoire temporaire 8 pour hijackthis.zip\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = res://C:\WINDOWS\nblxk.dll/sp.html#12047
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = res://C:\WINDOWS\nblxk.dll/sp.html#12047
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = res://C:\WINDOWS\nblxk.dll/sp.html#12047
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = res://C:\WINDOWS\nblxk.dll/sp.html#12047
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = res://C:\WINDOWS\nblxk.dll/sp.html#12047
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,SearchAssistant = res://C:\WINDOWS\nblxk.dll/sp.html#12047
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = res://C:\WINDOWS\nblxk.dll/sp.html#12047
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page = www.ebay.be
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
R3 - Default URLSearchHook is missing
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {2CA0CAD1-B247-07AB-7C43-FD61C655D5E2} - C:\WINDOWS\system32\atlsi32.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O4 - HKLM\..\Run: [USRpdA] C:\WINDOWS\SYSTEM32\USRmlnkA.exe RunServices \Device\3cpipe-USRpdA
O4 - HKLM\..\Run: [SiS KHooker] C:\WINDOWS\System32\khooker.exe
O4 - HKLM\..\Run: [Cmaudio] RunDll32 cmicnfg.cpl,CMICtrlWnd
O4 - HKLM\..\Run: [AdaptecDirectCD] "C:\Program Files\Roxio\Easy CD Creator 5\DirectCD\DirectCD.exe"
O4 - HKLM\..\Run: [Share-to-Web Namespace Daemon] C:\Program Files\Hewlett-Packard\HP Share-to-Web\hpgs2wnd.exe
O4 - HKLM\..\Run: [GSICONEXE] GSICON.EXE
O4 - HKLM\..\Run: [DSLAGENTEXE] dslagent.exe USB
O4 - HKLM\..\Run: [SSC_UserPrompt] C:\Program Files\Fichiers communs\Symantec Shared\Security Center\UsrPrmpt.exe
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\Grisoft\AVGFRE~1\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [AVG7_EMC] C:\PROGRA~1\Grisoft\AVGFRE~1\avgemc.exe
O4 - HKLM\..\Run: [ipdm32.exe] C:\WINDOWS\system32\ipdm32.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [Instant Access] rundll32.exe p2esocks_1019.dll,InstantAccess
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: SpySubtract.lnk = C:\Program Files\interMute\SpySubtract\SpySub.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\MSMSGS.EXE
O9 - Extra 'Tools' menuitem: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\MSMSGS.EXE
O14 - IERESET.INF: START_PAGE_URL=http://www.google.fr/
O16 - DPF: {2BC66F54-93A8-11D3-BEB6-00105AA9B6AE} (Symantec AntiVirus scanner) - http://security.symantec.com/sscv6/SharedContent/vc/bin/AvSniff.cab
O16 - DPF: {4C39376E-FA9D-4349-BACC-D305C1750EF3} (EPUImageControl Class) - http://tools.ebayimg.com/eps/wl/activex/EPUWALControl_v1-0-3-18.cab
O16 - DPF: {644E432F-49D3-41A1-8DD5-E099162EEEC5} (Symantec RuFSI Utility Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{7A5F8221-7C13-4E4F-9673-96CBC4480048}: NameServer = 195.238.2.22 195.238.2.21
O23 - Service: Network Security Service (NSS) ( 11Fßä#·ºÄÖ`I) - Unknown owner - C:\WINDOWS\system32\iejq32.exe (file missing)
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVGFRE~1\avgupsvc.exe
O23 - Service: SymWMI Service (SymWSC) - Symantec Corporation - C:\Program Files\Fichiers communs\Symantec Shared\Security Center\SymWSC.exe