Ordi attaqué ?

Bonjour,
Depuis quelques temps, je suis régulièrement attaqué par un fichier qui vient se mettre dans document and settings, il s'agit de etwfofrj.exe, mais je ne trouve rien sur le net... pourtant prevex trouve régulièrement ce fichier comme intru..
j'ai donc téléchargé hijackthis et voici le rapport, si quelqu'un veut bien m'aider, merci d'avance ..

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 22:26:46, on 07/03/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16608)
Boot mode: Normal

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\spoolsv.exe
H:\Program Files\Fichiers communs\LogiShrd\LVMVFM\LVPrcSrv.exe
H:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
H:\Program Files\NVIDIA Corporation\NetworkAccessManager\Apache Group\Apache2\bin\apache.exe
H:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
H:\Program Files\Fichiers communs\LogiShrd\LVCOMSER\LVComSer.exe
H:\Program Files\NVIDIA Corporation\NetworkAccessManager\bin\nSvcIp.exe
H:\Program Files\NVIDIA Corporation\NetworkAccessManager\bin\nSvcLog.exe
H:\WINDOWS\system32\nvsvc32.exe
H:\Program Files\Prevx2\PXAgent.exe
H:\WINDOWS\system32\svchost.exe
H:\Program Files\NVIDIA Corporation\NetworkAccessManager\bin\nSvcAppFlt.exe
H:\Program Files\NVIDIA Corporation\NetworkAccessManager\Apache Group\Apache2\bin\apache.exe
H:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
H:\Program Files\Alwil Software\Avast4\ashWebSv.exe
H:\WINDOWS\Explorer.EXE
H:\WINDOWS\SOUNDMAN.EXE
H:\WINDOWS\system32\wuauclt.exe
H:\WINDOWS\system32\RUNDLL32.EXE
H:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
H:\Program Files\Fichiers communs\LogiShrd\LComMgr\Communications_Helper.exe
H:\Program Files\Logitech\QuickCam\Quickcam.exe
H:\Program Files\Prevx2\PXConsole.exe
H:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe
H:\WINDOWS\system32\ctfmon.exe
H:\Program Files\Windows Live\Messenger\MsnMsgr.Exe
H:\Program Files\Macrogaming\SweetIM\SweetIM.exe
H:\Program Files\Fichiers communs\Logishrd\LQCVFX\COCIManager.exe
H:\Program Files\Fichiers communs\Ahead\Lib\NMBgMonitor.exe
H:\PROGRA~1\Magentic\bin\MgApp.exe
H:\PROGRA~1\INCRED~1\bin\IMApp.exe
H:\Program Files\Skype\Phone\Skype.exe
H:\Program Files\Microsoft Etudes\Microsoft Encarta 2007 - Études DVD\EDICT.EXE
H:\Program Files\Messenger\msmsgs.exe
H:\Program Files\FinePixViewer\QuickDCF.exe
H:\Program Files\Logitech\Desktop Messenger\8876480\Program\LogitechDesktopMessenger.exe
H:\Program Files\NETGEAR\WG111v2\WG111v2.exe
H:\Program Files\Google\Google Updater\GoogleUpdater.exe
H:\Program Files\OpenOffice.org 2.2\program\soffice.exe
H:\Program Files\OpenOffice.org 2.2\program\soffice.BIN
H:\Program Files\Skype\Plugin Manager\skypePM.exe
H:\Program Files\PrevxCSI\PrevxCSI.exe
H:\Program Files\Windows Live\Messenger\usnsvc.exe
H:\Program Files\Trend Micro\HijackThis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = https://www.bing.com/?cc=fr&toHttps=1&redig=D4322FEE7CF74A348CB9CE970F098EF5
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://mystart.incredimail.com/french
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
R3 - URLSearchHook: (no name) - {BC4FFE41-DE9F-46fa-B455-AAD49B9F9938} - (no file)
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - H:\Program Files\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: Malicious Scripts Scanner - {55EA1964-F5E4-4D6A-B9B2-125B37655FCB} - H:\Documents and Settings\All Users\Application Data\Prevx\pxbho.dll
O2 - BHO: Programme d'aide de l'Assistant de connexion Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - H:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: BHO pour Compagnon Web Encarta - {955BE0B8-BC85-4CAF-856E-8E0D8B610560} - H:\Program Files\Fichiers communs\Microsoft Shared\Encarta Web Companion\2007\ENCWCBAR.DLL
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - h:\program files\google\googletoolbar1.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - H:\Program Files\Google\GoogleToolbarNotifier\2.1.615.5858\swg.dll
O2 - BHO: Windows Live Toolbar Helper - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - H:\Program Files\Windows Live Toolbar\msntb.dll
O2 - BHO: e404 helper - {F10587E9-0E47-4CBE-ABCD-7DD20B8622FF} - (no file)
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - h:\program files\google\googletoolbar1.dll
O3 - Toolbar: Windows Live Toolbar - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - H:\Program Files\Windows Live Toolbar\msntb.dll
O3 - Toolbar: Compagnon Web Encarta - {147D6308-0614-4112-89B1-31402F9B82C4} - H:\Program Files\Fichiers communs\Microsoft Shared\Encarta Web Companion\2007\ENCWCBAR.DLL
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE H:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE H:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [avast!] H:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [REGSHAVE] H:\Program Files\REGSHAVE\REGSHAVE.EXE /AUTORUN
O4 - HKLM\..\Run: [NeroFilterCheck] H:\Program Files\Fichiers communs\Ahead\Lib\NeroCheck.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] H:\Program Files\Java\j2re1.4.2_07\bin\jusched.exe
O4 - HKLM\..\Run: [LogitechCommunicationsManager] "H:\Program Files\Fichiers communs\LogiShrd\LComMgr\Communications_Helper.exe"
O4 - HKLM\..\Run: [LogitechQuickCamRibbon] "H:\Program Files\Logitech\QuickCam\Quickcam.exe" /hide
O4 - HKLM\..\Run: [PrevxOne] "H:\Program Files\Prevx2\PXConsole.exe"
O4 - HKLM\..\Run: [!AVG Anti-Spyware] "H:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe" /minimized
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKCU\..\Run: [CTFMON.EXE] H:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MsnMsgr] "H:\Program Files\Windows Live\Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [IncrediMail] H:\Program Files\IncrediMail\bin\IncMail.exe /c
O4 - HKCU\..\Run: [SweetIM] H:\Program Files\Macrogaming\SweetIM\SweetIM.exe
O4 - HKCU\..\Run: [BgMonitor_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "H:\Program Files\Fichiers communs\Ahead\Lib\NMBgMonitor.exe"
O4 - HKCU\..\Run: [Magentic] H:\PROGRA~1\Magentic\bin\Magentic.exe /c
O4 - HKCU\..\Run: [Skype] "H:\Program Files\Skype\Phone\Skype.exe" /nosplash /minimized
O4 - HKCU\..\Run: [L07FXLRD_39728031] "H:\Program Files\Microsoft Etudes\Microsoft Encarta 2007 - Études DVD\EDICT.EXE" -m
O4 - HKCU\..\Run: [ccleaner] "H:\Program Files\CCleaner\CCleaner.exe" /AUTO
O4 - HKCU\..\Run: [MSMSGS] "H:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] H:\WINDOWS\system32\CTFMON.EXE (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] H:\WINDOWS\system32\CTFMON.EXE (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] H:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] H:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - Startup: OpenOffice.org 2.2.lnk = H:\Program Files\OpenOffice.org 2.2\program\quickstart.exe
O4 - Startup: PrevxCSI.lnk = ?
O4 - Global Startup: Exif Launcher.lnk = ?
O4 - Global Startup: Logitech Desktop Messenger.lnk = H:\Program Files\Logitech\Desktop Messenger\8876480\Program\LogitechDesktopMessenger.exe
O4 - Global Startup: NETGEAR WG111v2 Smart Wizard.lnk = H:\Program Files\NETGEAR\WG111v2\WG111v2.exe
O4 - Global Startup: Outil de mise à jour Google.lnk = H:\Program Files\Google\Google Updater\GoogleUpdater.exe
O8 - Extra context menu item: &Windows Live Search - res://H:\Program Files\Windows Live Toolbar\msntb.dll/search.htm
O8 - Extra context menu item: Add to Windows &Live Favorites - https://onedrive.live.com/?id=favorites
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://H:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O8 - Extra context menu item: Ouvrir dans un nouvel onglet d'arrière-plan - res://H:\Program Files\Windows Live Toolbar\Components\fr-fr\msntabres.dll.mui/229?1489d109b2714961b4dc5b526d467a8d
O8 - Extra context menu item: Ouvrir dans un nouvel onglet de premier plan - res://H:\Program Files\Windows Live Toolbar\Components\fr-fr\msntabres.dll.mui/230?1489d109b2714961b4dc5b526d467a8d
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - H:\Program Files\Java\j2re1.4.2_07\bin\npjpi142_07.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - H:\Program Files\Java\j2re1.4.2_07\bin\npjpi142_07.dll
O9 - Extra button: Ajout Direct - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - H:\Program Files\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra 'Tools' menuitem: &Ajout Direct dans Windows Live Writer - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - H:\Program Files\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - H:\PROGRA~1\MICROS~2\Office12\REFIEBAR.DLL
O9 - Extra button: Barre de recherche Encarta - {B205A35E-1FC4-4CE3-818B-899DBBB3388C} - H:\Program Files\Fichiers communs\Microsoft Shared\Encarta Search Bar\ENCSBAR.DLL
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - H:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - H:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - H:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - H:\Program Files\Messenger\msmsgs.exe
O16 - DPF: {4F1E5B1A-2A80-42CA-8532-2D05CB959537} (MSN Photo Upload Tool) - http://gfx1.hotmail.com/mail/w2/pr02/resources/MSNPUpld.cab
O16 - DPF: {5D6F45B3-9043-443D-A792-115447494D24} (UnoCtrl Class) - http://messenger.zone.msn.com/FR-FR/a-UNO1/GAME_UNO1.cab
O16 - DPF: {74D05D43-3236-11D4-BDCD-00C04F9A3B61} (HouseCall Control) - https://www.trendmicro.com/en_us/forHome/products/housecall.html
O16 - DPF: {7FC1B346-83E6-4774-8D20-1A6B09B0E737} (Windows Live Photo Upload Control) - http://leeloofamily.spaces.live.com/PhotoUpload/MsnPUpld.cab
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://acs.pandasoftware.com/activescan/as5free/asinst.cab
O16 - DPF: {C3F79A2B-B9B4-4A66-B012-3EE46475B072} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsPAClient.cab56907.cab
O16 - DPF: {C45B1500-7B63-47C2-AB25-C28CB46AFDEE} (MediaBar) - http://sib1.od2.com/common/musicmanager/installation/MusicManagerPlugin.CAB
O18 - Protocol: bwfile-8876480 - {9462A756-7B47-47BC-8C80-C34B9B80B32B} - H:\Program Files\Logitech\Desktop Messenger\8876480\Program\GAPlugProtocol-8876480.dll
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - H:\PROGRA~1\FICHIE~1\Skype\SKYPE4~1.DLL
O20 - Winlogon Notify: ibuntu - H:\WINDOWS\
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 - ALWIL Software - H:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
O23 - Service: avast! Web Scanner - ALWIL Software - H:\Program Files\Alwil Software\Avast4\ashWebSv.exe
O23 - Service: AVG Anti-Spyware Guard - GRISOFT s.r.o. - H:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: ForceWare Intelligent Application Manager (IAM) - Unknown owner - H:\Program Files\NVIDIA Corporation\NetworkAccessManager\bin\nSvcAppFlt.exe
O23 - Service: Forceware Web Interface (ForcewareWebInterface) - Apache Software Foundation - H:\Program Files\NVIDIA Corporation\NetworkAccessManager\Apache Group\Apache2\bin\apache.exe
O23 - Service: Google Updater Service (gusvc) - Google - H:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: LVCOMSer - Logitech Inc. - H:\Program Files\Fichiers communs\LogiShrd\LVCOMSER\LVComSer.exe
O23 - Service: Process Monitor (LVPrcSrv) - Logitech Inc. - H:\Program Files\Fichiers communs\LogiShrd\LVMVFM\LVPrcSrv.exe
O23 - Service: LVSrvLauncher - Logitech Inc. - H:\Program Files\Fichiers communs\LogiShrd\SrvLnch\SrvLnch.exe
O23 - Service: ForceWare IP service (nSvcIp) - NVIDIA - H:\Program Files\NVIDIA Corporation\NetworkAccessManager\bin\nSvcIp.exe
O23 - Service: ForceWare user log service (nSvcLog) - NVIDIA - H:\Program Files\NVIDIA Corporation\NetworkAccessManager\bin\nSvcLog.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - H:\WINDOWS\system32\nvsvc32.exe
O23 - Service: PREVXAgent - Prevx - H:\Program Files\Prevx2\PXAgent.exe
O23 - Service: PCTimeWatch (PTWsvc) - MainSoft - H:\Program Files\MainSoft\PC TimeWatch\PTWsvc.exe