[virus] infection?

Bonsoir à tous
je me décide à poster parce que j'ai un ordi tout neuf et je trouve que depuis quelques temps, il ne tourne pas aussi bien qu'il le devrait (lenteur au démarage, dans les jeux, dans la manipulation des fichiers)
L'ordinateur "bug" assez souvent, je n'arrive pas à démarer certaines applications.
De plus, il arrive que les fenetres d'Internet Explorer se ferment toutes seules.
J'ai suivi la première étape de votre méthode de désinfection avec ccleaner, par contre je n'ai pas pu me servir de AVG (j'ai vista), ni de l'antivirus en ligne.
Je vous poste le rapport de Hijackthis, si vous voyez quelque chose d'anormal, merci de m'aider!


en faisant le scan avec Hijackthis, j'ai eu ce message :

"For some reason your system denied write access to the host file. If any hijacked domains are in this file, Hijackthis may not me avle to fix this.
If that happens, you need to edit the file yourself. To do this, click start run and type :
notepad "C:\windows\system32\drivers\etc\hosts"
and press enter. Find the lines Hijackthis reports and delete them.
save the file as "host" with quotes and reboot. "


Logfile of HijackThis v1.99.1
Scan saved at 18:11:41, on 12/05/2007
Platform: Unknown Windows (WinNT 6.00.1904)
MSIE: Internet Explorer v7.00 (7.00.6000.16386)

Running processes:
C:\Windows\system32\Dwm.exe
C:\Windows\Explorer.EXE
C:\Windows\system32\taskeng.exe
C:\Program Files\ASUS\ASUS Live Update\ALU.exe
C:\Windows\system32\taskeng.exe
C:\Program Files\Windows Defender\MSASCui.exe
C:\Windows\System32\rundll32.exe
C:\Windows\RtHDVCpl.exe
C:\Program Files\Motorola\SMSERIAL\sm56hlpr.exe
C:\Program Files\Apoint2K\Apoint.exe
C:\Program Files\ASUS\ATK Media\DMedia.exe
C:\Program Files\PowerForPhone\PowerForPhone\PowerForPhone.exe
C:\Program Files\QuickTime\qttask.exe
C:\Program Files\Alwil Software\Avast4\ashDisp.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Windows\ehome\ehtray.exe
C:\Program Files\ASUS\Asus MultiFrame\MultiFrame.exe
C:\Program Files\OpenOffice.org 2.1\program\soffice.exe
C:\Windows\ehome\ehmsas.exe
C:\Program Files\OpenOffice.org 2.1\program\soffice.BIN
C:\Program Files\Apoint2K\ApMsgFwd.exe
C:\Program Files\Apoint2K\Apntex.exe
C:\Program Files\Apoint2K\HidFind.exe
C:\Program Files\Apoint2K\Apvfb.exe
C:\Windows\System32\mobsync.exe
C:\Program Files\Internet Explorer\ieuser.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Windows\system32\Macromed\Flash\FlashUtil9c.exe
C:\Windows\system32\SearchFilterHost.exe
C:\Program Files\Hijackthis Version Française\VERSION TRADUITE ORIGINALE.EXE

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.wanadoo.fr/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O1 - Hosts: ::1 localhost
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O4 - HKLM\..\Run: [Windows Defender] %ProgramFiles%\Windows Defender\MSASCui.exe -hide
O4 - HKLM\..\Run: [NvSvc] RUNDLL32.EXE C:\Windows\system32\nvsvc.dll,nvsvcStart
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\Windows\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\Windows\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [RtHDVCpl] RtHDVCpl.exe
O4 - HKLM\..\Run: [SMSERIAL] C:\Program Files\Motorola\SMSERIAL\sm56hlpr.exe
O4 - HKLM\..\Run: [Apoint] C:\Program Files\Apoint2K\Apoint.exe
O4 - HKLM\..\Run: [ATKMEDIA] C:\Program Files\ASUS\ATK Media\DMEDIA.EXE
O4 - HKLM\..\Run: [PowerForPhone] C:\Program Files\PowerForPhone\PowerForPhone\PowerForPhone.exe
O4 - HKLM\..\Run: [NeroFilterCheck] C:\Program Files\Common Files\Ahead\Lib\NeroCheck.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [!AVG Anti-Spyware] "C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe" /minimized
O4 - HKCU\..\Run: [WindowsWelcomeCenter] rundll32.exe oobefldr.dll,ShowWelcomeCenter
O4 - HKCU\..\Run: [ehTray.exe] C:\Windows\ehome\ehTray.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O4 - Startup: OpenOffice.org 2.1.lnk = C:\Program Files\OpenOffice.org 2.1\program\quickstart.exe
O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: MultiFrame.lnk = ?
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\j2re1.4.1\bin\npjpi141.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\j2re1.4.1\bin\npjpi141.dll
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)
O10 - Unknown file in Winsock LSP: c:\windows\system32\nlaapi.dll
O10 - Unknown file in Winsock LSP: c:\windows\system32\napinsp.dll
O11 - Options group: [INTERNATIONAL] International*
O13 - Gopher Prefix:
O16 - DPF: {5D86DDB5-BDF9-441B-9E9E-D4730F4EE499} (BDSCANONLINE Control) - http://download.bitdefender.com/resources/scan8/oscan8.cab
O16 - DPF: {8AD9C840-044E-11D1-B3E9-00805F499D93} (Environnement d'exécution Java 1.4.1) - http://javadl-esd.sun.com/update/1.4.1/jinstall-1_4_1-window­s-i586.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/s­wflash.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{187B68FD-4620-4DC2-BCDD-A­393F85FE50B}: NameServer = 208.67.222.222,208.67.220.220
O17 - HKLM\System\CS1\Services\Tcpip\..\{187B68FD-4620-4DC2-BCDD-A­393F85FE50B}: NameServer = 208.67.222.222,208.67.220.220
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
O23 - Service: ASLDR Service (ASLDRService) - Unknown owner - C:\Program Files\ATK Hotkey\ASLDRSrv.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 - Anti-Malware Development a.s. - C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: Symantec Lic NetConnect service (CLTNetCnService) - Unknown owner - C:\Program Files\Common Files\Symantec Shared\ccSvcHst.exe" /h ccCommon (file missing)
O23 - Service: @%SystemRoot%\ehome\ehstart.dll,-101 (ehstart) - Unknown owner - %windir%\system32\svchost.exe (file missing)
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\Common Files\LightScribe\LSSrvc.exe
O23 - Service: NBService - Nero AG - C:\Program Files\Nero\Nero 7\Nero BackItUp\NBService.exe
O23 - Service: NMIndexingService - Nero AG - C:\Program Files\Common Files\Ahead\Lib\NMIndexingService.exe
O23 - Service: @%SystemRoot%\system32\qwave.dll,-1 (QWAVE) - Unknown owner - %windir%\system32\svchost.exe (file missing)
O23 - Service: @%SystemRoot%\system32\seclogon.dll,-7001 (seclogon) - Unknown owner - %windir%\system32\svchost.exe (file missing)
O23 - Service: spmgr - Unknown owner - C:\Program Files\ASUS\NB Probe\SPM\spmgr.exe
O23 - Service: Syntek AVStream USB2.0 WebCam Service (StkSSrv) - Syntek America Inc. - C:\Windows\System32\StkSrv.exe
O23 - Service: @%ProgramFiles%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown owner - %ProgramFiles%\Windows Media Player\wmpnetwk.exe (file missing)

merci pour votre aide


lucie

Configuration: Windows Vista
Internet Explorer 7.0