Internet bug et très lent

J'ai fait un log hijackthis :

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 10:37:11, on 07/01/2012
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
Boot mode: Normal

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\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Avira\AntiVir Desktop\sched.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\AMD\RAIDXpert\jetty\extra\win32\Wrapper.exe
C:\Program Files\Avira\AntiVir Desktop\avguard.exe
C:\Program Files\Java\jre6\bin\jqs.exe
C:\WINDOWS\system32\KaraokeSer.exe
C:\Program Files\Fichiers communs\LightScribe\LSSrvc.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\Program Files\AMD\RAIDXpert\_jvm\bin\java.exe
C:\WINDOWS\system32\PSIService.exe
C:\Program Files\Realtek\Diagnostics Utility\8169Diag.exe
C:\Program Files\Brownie\BrstsWnd.exe
C:\Program Files\Fichiers communs\Java\Java Update\jusched.exe
C:\Program Files\Avira\AntiVir Desktop\avgnt.exe
C:\WINDOWS\system32\RunDLL32.exe
C:\WINDOWS\system32\svchost.exe
C:\PROGRA~1\WINDOW~4\Datamngr\DATAMN~1.EXE
C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Hewlett-Packard\Digital Imaging\bin\hpohmr08.exe
C:\Program Files\Hewlett-Packard\Digital Imaging\bin\hpotdd01.exe
C:\Program Files\Brownie\brpjp04a.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\Mozilla Firefox\plugin-container.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Documents and Settings\Propriétaire\Mes documents\Téléchargements\HiJackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.orange.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 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre6\bin\ssv.dll
O2 - BHO: Searchqu Toolbar - {99079a25-328f-4bd4-be04-00955acaa0a7} - C:\PROGRA~1\WINDOW~4\Datamngr\ToolBar\searchqudtx.dll
O2 - BHO: DataMngr - {9D717F81-9148-4f12-8568-69135F087DB0} - C:\PROGRA~1\WINDOW~4\Datamngr\BROWSE~1.DLL
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - C:\Program Files\Google\Google Toolbar\GoogleToolbar_32.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files\Google\GoogleToolbarNotifier\5.7.7018.1622\swg.dll
O2 - BHO: Mega Manager IE Click Monitor - {bf00e119-21a3-4fd1-b178-3b8537e75c92} - C:\Program Files\M.gaupload\Mega Manager\MegaIEMn.dll
O2 - BHO: PDF-XChange Viewer IE-Plugin - {C5D07EB6-BBCE-4DAE-ACBB-D13A8D28CB1F} - C:\Program Files\Tracker Software\PDF-XChange Viewer\pdf-viewer\PDFXCviewIEPlugin.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - C:\Program Files\Java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
O3 - Toolbar: Google Toolbar - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - C:\Program Files\Google\Google Toolbar\GoogleToolbar_32.dll
O3 - Toolbar: Searchqu Toolbar - {99079a25-328f-4bd4-be04-00955acaa0a7} - C:\PROGRA~1\WINDOW~4\Datamngr\ToolBar\searchqudtx.dll
O4 - HKLM\..\Run: [8169Diag] C:\Program Files\Realtek\Diagnostics Utility\8169Diag.exe /hw
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [BrStsWnd] C:\Program Files\Brownie\BrstsWnd.exe Autorun
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Fichiers communs\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [avgnt] "C:\Program Files\Avira\AntiVir Desktop\avgnt.exe" /min
O4 - HKLM\..\Run: [HDAudDeck] C:\Program Files\VIA\VIAudioi\HDADeck\HDeck.exe 1
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [NvMediaCenter] RunDLL32.exe NvMCTray.dll,NvTaskbarInit -login
O4 - HKLM\..\Run: [nwiz] C:\Program Files\NVIDIA Corporation\nview\nwiz.exe /installquiet
O4 - HKLM\..\Run: [DATAMNGR] C:\PROGRA~1\WINDOW~4\Datamngr\DATAMN~1.EXE
O4 - HKCU\..\Run: [SpybotSD TeaTimer] C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [swg] "C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe"
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-21-1409082233-1979792683-839522115-1002\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'UpdatusUser')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: hp psc 1000 series.lnk = ?
O4 - Global Startup: hpoddt01.exe.lnk = ?
O4 - Global Startup: SRS Premium Sound.lnk = C:\Program Files\SRS Labs\SRS Premium Sound\SRSPremiumSound_XP.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O8 - Extra context menu item: Liens de téléchargement avec Mega Manager... - C:\Program Files\M.gaupload\Mega Manager\mm_file.htm
O9 - Extra button: (no name) - {85d1f590-48f4-11d9-9669-0800200c9a66} - C:\WINDOWS\bdoscandel.exe (file missing)
O9 - Extra 'Tools' menuitem: Uninstall BitDefender Online Scanner - {85d1f590-48f4-11d9-9669-0800200c9a66} - C:\WINDOWS\bdoscandel.exe (file missing)
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search & Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://www.update.microsoft.com/microsoftupdate/v6/V5Controls/en/x86/client/muweb_site.cab?1323965394359
O20 - AppInit_DLLs: C:\PROGRA~1\WINDOW~4\Datamngr\datamngr.dll C:\PROGRA~1\WINDOW~4\Datamngr\IEBHO.dll
O23 - Service: AMD RAIDXpert (AMDRAIDXpert) - Unknown owner - C:\Program Files\AMD\RAIDXpert\jetty\extra\win32\Wrapper.exe
O23 - Service: Avira AntiVir Planificateur (AntiVirSchedulerService) - Avira GmbH - C:\Program Files\Avira\AntiVir Desktop\sched.exe
O23 - Service: Avira AntiVir Guard (AntiVirService) - Avira GmbH - C:\Program Files\Avira\AntiVir Desktop\avguard.exe
O23 - Service: Service Google Update (gupdate) (gupdate) - Google Inc. - C:\Program Files\Google\Update\GoogleUpdate.exe
O23 - Service: Service Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Program Files\Google\Update\GoogleUpdate.exe
O23 - Service: Google Software Updater (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Program Files\Java\jre6\bin\jqs.exe
O23 - Service: VIA Karaoke digital mixer Service (KaraokeService) - VIA Technologies, Inc. - C:\WINDOWS\system32\KaraokeSer.exe
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Hewlett-Packard Company - C:\Program Files\Fichiers communs\LightScribe\LSSrvc.exe
O23 - Service: Ma-Config Service (maconfservice) - CybelSoft - C:\Program Files\ma-config.com\maconfservice.exe
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: NVIDIA Update Service Daemon (nvUpdatusService) - NVIDIA Corporation - C:\Program Files\NVIDIA Corporation\NVIDIA Updatus\daemonu.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\system32\HPZipm12.exe
O23 - Service: ProtexisLicensing - Unknown owner - C:\WINDOWS\system32\PSIService.exe

End of file - 8950 bytes

bonjour ,
une solution peut être :
débrider la bande passante par gpedit.msc
ou réinstaller firefox en prenant soin de tout effacer de l'ancienne version .