PC très lent

Bonjour,
Voilà, depuis quelque temps mon pc est devenu très très lent au démarrage et à l'exécution des programmes. Aussi sur Mozilla une page s'ouvre systématiquement avec un moteur de recherche et pendant la navigation plusieurs fenêtres s'ouvrent de façon intempestives.
J'ai passé sous ccleaner et malwarebytes.
Puis j'ai lancer un scan Hijackthis. Quelqu'un peut il m'aider car je bloque sur la procédure qui suit l'obtention Hijackthis.
Merci pour votre aide.
Voici le log :

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 19:03:16, on 30/11/2014
Platform: Windows XP SP3 (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\csrss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\Program Files\Rohos\welcome.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Alwil Software\Avast5\AvastSvc.exe
C:\WINDOWS\system32\brsvc01a.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\brss01a.exe
C:\Program Files\Google\Update\1.3.25.11\GoogleCrashHandler.exe
C:\Program Files\Index Education\Mise a jour automatique\ServiceMiseAJourIndex.exe
C:\Program Files\Fichiers communs\Apple\Mobile Device Support\AppleMobileDeviceService.exe
C:\Program Files\Bonjour\mDNSResponder.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Fichiers communs\InterVideo\DeviceService\DevSvc.exe
C:\Program Files\Nuance\PaperPort\PDFProFiltSrvPP.exe
C:\Program Files\RealNetworks\RealDownloader\rndlresolversvc.exe
C:\Documents and Settings\All Users\Application Data\6fb1f30a-cea7-4ccf-bff8-acbecbfe46f9\plugincontainer.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Fichiers communs\6fb1f30a-cea7-4ccf-bff8-acbecbfe46f9\updater.exe
C:\Program Files\Yahoo!\SoftwareUpdate\YahooAUService.exe
C:\WINDOWS\system32\wbem\wmiprvse.exe
C:\WINDOWS\System32\alg.exe
C:\WINDOWS\RTHDCPL.EXE
C:\WINDOWS\system32\rundll32.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Fichiers communs\Java\Java Update\jusched.exe
C:\Program Files\Nuance\PDF Viewer Plus\pdfpro5hook.exe
C:\Program Files\Alwil Software\Avast5\AvastUI.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\Real\RealPlayer\update\realsched.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Documents and Settings\All Users\Application Data\FLEXnet\Connect\11\ISUSPM.exe
C:\Program Files\Fichiers communs\Apple\Internet Services\iCloudServices.exe
C:\WINDOWS\System32\wbem\unsecapp.exe
C:\WINDOWS\system32\wscntfy.exe
C:\Program Files\Malwarebytes Anti-Malware\mbamservice.exe
C:\Program Files\Malwarebytes Anti-Malware\mbamscheduler.exe
C:\Program Files\RealNetworks\RealDownloader\recordingmanager.exe
C:\Program Files\Trend Micro\HiJackThis\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = https://fr.yahoo.com?fr=hp-avast&type=avastbcl
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = https://fr.search.yahoo.com/yhs/search?type=avastbcl&hspart=avast&hsimp=yhs-001&p={searchTerms}
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = www.google.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = https://fr.yahoo.com?fr=hp-avast&type=avastbcl
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = https://fr.search.yahoo.com/yhs/search?type=avastbcl&hspart=avast&hsimp=yhs-001&p={searchTerms}
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = https://fr.yahoo.com?fr=hp-avast&type=avastbcl
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
R3 - URLSearchHook: (no name) - {4daac69c-cba7-45e2-9bc8-1044483d3352} - (no file)
R3 - URLSearchHook: (no name) - {249d74a3-bd19-4657-b6ce-e62f480a20de} - (no file)
O2 - BHO: IncrediMail MediaBar Francais 2 - {249d74a3-bd19-4657-b6ce-e62f480a20de} - (no file)
O2 - BHO: (no name) - {3049C3E9-B461-4BC5-8870-4C09146192CA} - (no file)
O2 - BHO: ST_France - {4daac69c-cba7-45e2-9bc8-1044483d3352} - (no file)
O2 - BHO: (no name) - {4E7BD74F-2B8D-469E-8DA9-FD60BB9AAE33} - (no file)
O2 - BHO: (no name) - {551A852F-39A6-44A7-9C13-AFBEC9185A9D} - (no file)
O2 - BHO: avast! Online Security - {8E5E2654-AD2D-48bf-AC2D-D17F00898D06} - (no file)
O2 - BHO: (no name) - {AA58ED58-01DD-4d91-8333-CF10577473F7} - (no file)
O2 - BHO: 01NET.com V1 - {e4f7b179-a3f6-47d8-9832-cb7b2627312a} - (no file)
O2 - BHO: Internet Program - {ff0021ad-2cc3-4e0d-8e3c-b4153a64a495} - C:\Program Files\Internet Program\Extensions\ff0021ad-2cc3-4e0d-8e3c-b4153a64a495.dll
O3 - Toolbar: (no name) - {4E7BD74F-2B8D-469E-8DA9-FD60BB9AAE33} - (no file)
O3 - Toolbar: (no name) - {3EA8D036-C9E7-4721-BCDF-C13D00C4CC39} - (no file)
O3 - Toolbar: (no name) - {4daac69c-cba7-45e2-9bc8-1044483d3352} - (no file)
O3 - Toolbar: (no name) - {249d74a3-bd19-4657-b6ce-e62f480a20de} - (no file)
O3 - Toolbar: (no name) - {e4f7b179-a3f6-47d8-9832-cb7b2627312a} - (no file)
O3 - Toolbar: (no name) - {CC1A175A-E45B-41ED-A30C-C9B1D7A0C02F} - (no file)
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [BluetoothAuthenticationAgent] rundll32.exe bthprops.cpl,,BluetoothAuthenticationAgent
O4 - HKLM\..\Run: [ZoneAlarm Client] "C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKLM\..\Run: [APSDaemon] "C:\Program Files\Fichiers communs\Apple\Apple Application Support\APSDaemon.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Fichiers communs\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [PDFHook] C:\Program Files\Nuance\PDF Viewer Plus\pdfpro5hook.exe
O4 - HKLM\..\Run: [PDF5 Registry Controller] C:\Program Files\Nuance\PDF Viewer Plus\RegistryController.exe
O4 - HKLM\..\Run: [AvastUI.exe] "C:\Program Files\Alwil Software\Avast5\AvastUI.exe" /nogui
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [ISUSPM Startup] c:\PROGRA~1\FICHIE~1\INSTAL~1\UPDATE~1\isuspm.exe -startup
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Real\RealPlayer\update\realsched.exe" -osboot
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKLM\..\RunOnce: [Malwarebytes Anti-Malware (cleanup)] "C:\Documents and Settings\All Users\Application Data\Malwarebytes\Malwarebytes Anti-Malware\mbamdor.exe" "C:\Documents and Settings\All Users\Application Data\Malwarebytes\Malwarebytes Anti-Malware"
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [ISUSPM] C:\Documents and Settings\All Users\Application Data\FLEXnet\Connect\11\ISUSPM.exe -scheduler
O4 - HKCU\..\Run: [iCloudServices] C:\Program Files\Fichiers communs\Apple\Internet Services\iCloudServices.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O8 - Extra context menu item: Ouvrir avec PDF Viewer Plus - res://C:\Program Files\Nuance\PDF Viewer Plus\Bin\PlusIEContextMenu.dll/PlusIEContextMenu.htm
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe (file missing)
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe (file missing)
O22 - SharedTaskScheduler: Pré-chargeur Browseui - {438755C2-A8BA-11D1-B96B-00A0C90312E1} - C:\WINDOWS\System32\browseui.dll
O22 - SharedTaskScheduler: Démon de cache des catégories de composant - {8C7461EF-2B13-11d2-BE35-3078302C2030} - C:\WINDOWS\System32\browseui.dll
O23 - Service: Adobe Flash Player Update Service (AdobeFlashPlayerUpdateSvc) - Adobe Systems Incorporated - C:\WINDOWS\system32\Macromed\Flash\FlashPlayerUpdateService.exe
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files\Fichiers communs\Apple\Mobile Device Support\AppleMobileDeviceService.exe
O23 - Service: avast! Antivirus - AVAST Software - C:\Program Files\Alwil Software\Avast5\AvastSvc.exe
O23 - Service: Service Bonjour (Bonjour Service) - Apple Inc. - C:\Program Files\Bonjour\mDNSResponder.exe
O23 - Service: BrSplService (Brother XP spl Service) - brother Industries Ltd - C:\WINDOWS\system32\brsvc01a.exe
O23 - Service: BrYNSvc - Brother Industries, Ltd. - C:\Program Files\Browny02\BrYNSvc.exe
O23 - Service: Capture Device Service - InterVideo Inc. - C:\Program Files\Fichiers communs\InterVideo\DeviceService\DevSvc.exe
O23 - Service: Service d'administration du Gestionnaire de disque logique (dmadmin) - Unknown owner - C:\WINDOWS\System32\dmadmin.exe
O23 - Service: Journal des événements (Eventlog) - Unknown owner - C:\WINDOWS\system32\services.exe
O23 - Service: Service Google Update (gupdate) (gupdate) - Unknown owner - C:\Program Files\Google\Update\GoogleUpdate.exe
O23 - Service: Service Google Update (gupdatem) (gupdatem) - Unknown owner - 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: Service COM de gravage de CD IMAPI (ImapiService) - Unknown owner - C:\WINDOWS\System32\imapi.exe
O23 - Service: Service de l'iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Mise à jour automatique - Index Education (MajIndexEducationService) - Index Education - C:\Program Files\Index Education\Mise a jour automatique\ServiceMiseAJourIndex.exe
O23 - Service: MBAMScheduler - Malwarebytes Corporation - C:\Program Files\Malwarebytes Anti-Malware\mbamscheduler.exe
O23 - Service: MBAMService - Malwarebytes Corporation - C:\Program Files\Malwarebytes Anti-Malware\mbamservice.exe
O23 - Service: McAfee Security Scan Component Host Service (McComponentHostService) - McAfee, Inc. - C:\Program Files\McAfee Security Scan\3.0.285\McCHSvc.exe
O23 - Service: Mozilla Maintenance Service (MozillaMaintenance) - Mozilla Foundation - C:\Program Files\Mozilla Maintenance Service\maintenanceservice.exe
O23 - Service: NBService - Nero AG - C:\Program Files\Nero\Nero 7\Nero BackItUp\NBService.exe
O23 - Service: PDFProFiltSrvPP - Nuance Communications, Inc. - C:\Program Files\Nuance\PaperPort\PDFProFiltSrvPP.exe
O23 - Service: Plug-and-Play (PlugPlay) - Unknown owner - C:\WINDOWS\system32\services.exe
O23 - Service: RealNetworks Downloader Resolver Service - Unknown owner - C:\Program Files\RealNetworks\RealDownloader\rndlresolversvc.exe
O23 - Service: Rohos welcome screen elements (Rohos) - Tesline-Service SRL - C:\Program Files\Rohos\ntserv.exe
O23 - Service: Carte à puce (SCardSvr) - Unknown owner - C:\WINDOWS\System32\SCardSvr.exe
O23 - Service: Service Mgr InternetProgram - Unknown owner - C:\Documents and Settings\All Users\Application Data\6fb1f30a-cea7-4ccf-bff8-acbecbfe46f9\plugincontainer.exe
O23 - Service: ServiceLayer - Nokia - C:\Program Files\PC Connectivity Solution\ServiceLayer.exe
O23 - Service: Journaux et alertes de performance (SysmonLog) - Unknown owner - C:\WINDOWS\system32\smlogsvc.exe
O23 - Service: Update Mgr InternetProgram - Unknown owner - C:\Program Files\Fichiers communs\6fb1f30a-cea7-4ccf-bff8-acbecbfe46f9\updater.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs, LLC - C:\WINDOWS\system32\ZoneLabs\vsmon.exe
O23 - Service: Cliché instantané de volume (VSS) - Unknown owner - C:\WINDOWS\System32\vssvc.exe
O23 - Service: Yahoo! Updater (YahooAUService) - Yahoo! Inc. - C:\Program Files\Yahoo!\SoftwareUpdate\YahooAUService.exe