Mon rapport hijackthis

Bonjour,

J'ai un vieil ordi (7 ans) qui plante ou redémarre tout seul très souvent. Firefox aussi plante très souvent. Voici mon rapport hijackthis, quelqu'un peut-il l'analyser?
Merci d'avance!

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 21:41:59, on 06/06/2009
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
Boot mode: Normal

Running processes:
D:\WINDOWS\System32\smss.exe
D:\WINDOWS\SYSTEM32\winlogon.exe
D:\WINDOWS\system32\services.exe
D:\WINDOWS\system32\lsass.exe
D:\WINDOWS\system32\svchost.exe
D:\WINDOWS\System32\svchost.exe
D:\WINDOWS\system32\ZoneLabs\vsmon.exe
D:\WINDOWS\Explorer.EXE
D:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
D:\Program Files\Alwil Software\Avast4\ashServ.exe
D:\WINDOWS\system32\spoolsv.exe
D:\PROGRA~2\ESRI\License\arcgis9x\lmgrd.exe
D:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
D:\Program Files\Java\jre6\bin\jqs.exe
D:\WINDOWS\system32\lxddcoms.exe
D:\WINDOWS\system32\svchost.exe
D:\PROGRA~2\ESRI\License\arcgis9x\ARCGIS.exe
D:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
D:\Program Files\Alwil Software\Avast4\ashWebSv.exe
D:\Program Files\NVIDIA Corporation\NvMixer\NVMixerTray.exe
D:\PROGRA~2\ALWILS~1\Avast4\ashDisp.exe
D:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe
D:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe
D:\Program Files\Java\jre6\bin\jusched.exe
D:\WINDOWS\system32\ctfmon.exe
D:\Program Files\Windows Live\Messenger\msnmsgr.exe
D:\Program Files\Belkin\F5D7050v5\Belkinwcui.exe
D:\WINDOWS\system32\wuauclt.exe
D:\Program Files\Windows Live\Contacts\wlcomm.exe
D:\Program Files\Internet Explorer\iexplore.exe
D:\Program Files\Mozilla Firefox\firefox.exe
E:\programme\Anti virus, Spyware, Firewall\HIJACK THIS\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 = https://www.msn.com/fr-fr
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - D:\Program Files\Fichiers communs\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O2 - BHO: Programme d'aide de l'Assistant de connexion Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - D:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - D:\Program Files\Java\jre6\bin\jp2ssv.dll
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - D:\Program Files\Java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
O4 - HKLM\..\Run: [NVMixerTray] "D:\Program Files\NVIDIA Corporation\NvMixer\NVMixerTray.exe"
O4 - HKLM\..\Run: [avast!] D:\PROGRA~2\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [UserFaultCheck] %systemroot%\system32\dumprep 0 -u
O4 - HKLM\..\Run: [!AVG Anti-Spyware] "D:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe" /minimized
O4 - HKLM\..\Run: [ZoneAlarm Client] "D:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKLM\..\Run: [AdobeCS4ServiceManager] "D:\Program Files\Fichiers communs\Adobe\CS4ServiceManager\CS4ServiceManager.exe" -launchedbylogin
O4 - HKLM\..\Run: [QuickTime Task] "D:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [SunJavaUpdateSched] "D:\Program Files\Java\jre6\bin\jusched.exe"
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "D:\Program Files\Adobe\Reader 9.0\Reader\Reader_sl.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] D:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [msnmsgr] "D:\Program Files\Windows Live\Messenger\msnmsgr.exe" /background
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] D:\WINDOWS\system32\CTFMON.EXE (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] D:\WINDOWS\system32\CTFMON.EXE (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] D:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] D:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: Belkin Wireless G USB Adapter Client Utility.lnk = ?
O8 - Extra context menu item: Add to Google Photos Screensa&ver - res://D:\WINDOWS\system32\GPhotos.scr/200
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://D:\PROGRA~2\MICROS~2\Office12\EXCEL.EXE/3000
O9 - Extra button: (no name) - {85d1f590-48f4-11d9-9669-0800200c9a66} - D:\WINDOWS\bdoscandel.exe
O9 - Extra 'Tools' menuitem: Uninstall BitDefender Online Scanner v8 - {85d1f590-48f4-11d9-9669-0800200c9a66} - D:\WINDOWS\bdoscandel.exe
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - D:\PROGRA~2\MICROS~2\Office12\REFIEBAR.DLL
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - D:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - D:\Program Files\Messenger\msmsgs.exe
O16 - DPF: {0CCA191D-13A6-4E29-B746-314DEE697D83} (Facebook Photo Uploader 5 Control) - http://upload.facebook.com/controls/2008.10.10_v5.5.8/FacebookPhotoUploader5.cab
O16 - DPF: {4F1E5B1A-2A80-42CA-8532-2D05CB959537} (MSN Photo Upload Tool) - http://gfx2.hotmail.com/mail/w3/pr01/resources/MSNPUpld.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://www.update.microsoft.com/...
O16 - DPF: {814EA0DA-E0D9-4AA4-833C-A1A6D38E79E9} (DASWebDownload Class) - http://das.microsoft.com/activate/cab/x86/i486/NTANSI/retail/DASAct.cab
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - D:\PROGRA~2\FICHIE~1\Skype\SKYPE4~1.DLL
O20 - Winlogon Notify: winbfi32 - winbfi32.dll (file missing)
O23 - Service: ArcGIS License Manager - Unknown owner - D:\PROGRA~2\ESRI\License\arcgis9x\lmgrd.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - D:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - ALWIL Software - D:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - ALWIL Software - D:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
O23 - Service: avast! Web Scanner - ALWIL Software - D:\Program Files\Alwil Software\Avast4\ashWebSv.exe
O23 - Service: AVG Anti-Spyware Guard - GRISOFT s.r.o. - D:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: FLEXnet Licensing Service - Acresso Software Inc. - D:\Program Files\Fichiers communs\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: Google Updater Service (gusvc) - Google - D:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - D:\Program Files\Fichiers communs\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - D:\Program Files\Java\jre6\bin\jqs.exe
O23 - Service: lxddCATSCustConnectService - Lexmark International, Inc. - D:\WINDOWS\System32\spool\DRIVERS\W32X86\3\\lxddserv.exe
O23 - Service: lxdd_device - - D:\WINDOWS\system32\lxddcoms.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs, LLC - D:\WINDOWS\system32\ZoneLabs\vsmon.exe