ORDINATEUR LENT aide svp

Bonjour,
mon ordinateur m affiche une certaine lenteur ces derniers temps voici mon log.
Quelqu un pourrait il m aider s il vous plait ?

Logfile of HijackThis v1.99.1
Scan saved at 12:04:08, on 27/08/2008
Platform: Windows 2000 SP4 (WinNT 5.00.2195)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

Running processes:
C:\WINNT\System32\smss.exe
C:\WINNT\system32\winlogon.exe
C:\WINNT\system32\services.exe
C:\WINNT\system32\lsass.exe
C:\WINNT\system32\ibmpmsvc.exe
C:\WINNT\system32\Ati2evxx.exe
C:\WINNT\System32\S24EvMon.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\System32\svchost.exe
C:\WINNT\system32\spoolsv.exe
C:\Program Files\Network Associates\Common Framework\FrameworkService.exe
C:\Program Files\Network Associates\VirusScan\Mcshield.exe
C:\Program Files\Network Associates\VirusScan\VsTskMgr.exe
C:\WINNT\System32\RegSrvc.exe
C:\WINNT\system32\MSTask.exe
C:\Program Files\Analog Devices\SoundMAX\SMAgent.exe
C:\WINNT\system32\stisvc.exe
C:\WINNT\system32\TpKmpSVC.exe
C:\Program Files\ThinkPad\Utilities\TpKmapMn.exe
C:\WINNT\System32\WBEM\WinMgmt.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\system32\Ati2evxx.exe
C:\WINNT\Explorer.EXE
C:\WINNT\system32\RunDll32.exe
C:\PROGRA~1\Lenovo\PkgMgr\HOTKEY\TPHKMGR.exe
C:\WINNT\system32\PRPCUI.exe
C:\Program Files\ThinkPad\Utilities\TpKmapMn.exe
C:\Program Files\Lenovo\PkgMgr\HOTKEY\TPONSCR.exe
C:\Program Files\Lenovo\PkgMgr\HOTKEY_1\TpScrex.exe
C:\Program Files\Analog Devices\SoundMAX\SMax4PNP.exe
C:\Program Files\Cisco Systems\Aironet Client Monitor\ACUMon.Exe
C:\WINNT\system32\PRISMSTA.EXE
C:\WINNT\system32\LVCOMSX.EXE
C:\Program Files\ANI\ANIWZCS2 Service\WZCSLDR2.exe
C:\Program Files\Network Associates\VirusScan\SHSTAT.EXE
C:\Program Files\Network Associates\Common Framework\UpdaterUI.exe
C:\Program Files\Fichiers communs\Network Associates\TalkBack\TBMon.exe
C:\Program Files\Analog Devices\SoundMAX\smax4.exe
C:\Program Files\MSN Messenger\msnmsgr.exe
C:\Program Files\Microsoft Office\Office\OUTLOOK.EXE
C:\Program Files\Skype\Phone\Skype.exe
C:\Program Files\Skype\Plugin Manager\SkypePM.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\a-squared Free\a2service.exe
C:\DOCUME~1\Mounia\LOCALS~1\Temp\Rar$EX00.628\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.sfr.fr/offres-numericable.html
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = https://home.sweetim.com/
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,AutoConfigURL = 192.168.0.1
R3 - URLSearchHook: Yahoo! Toolbar avec bloqueur de fenêtres pop-up - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll (file missing)
O2 - BHO: Yahoo! Toolbar Helper - {02478D38-C3F9-4EFB-9B51-7695ECA05670} - C:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll (file missing)
O2 - BHO: Aide pour le lien d'Adobe PDF Reader - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Fichiers communs\Adobe\Acrobat\ActiveX\AcroIEHelper.dll (file missing)
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_02\bin\ssv.dll
O3 - Toolbar: Yahoo! Toolbar avec bloqueur de fenêtres pop-up - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll (file missing)
O4 - HKLM\..\Run: [ATIPTA] C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKLM\..\Run: [BMMGAG] RunDll32 C:\PROGRA~1\ThinkPad\UTILIT~1\pwrmonit.dll,StartPwrMonitor
O4 - HKLM\..\Run: [BMMLREF] C:\Program Files\ThinkPad\Utilities\BMMLREF.EXE
O4 - HKLM\..\Run: [TPHOTKEY] C:\PROGRA~1\Lenovo\PkgMgr\HOTKEY\TPHKMGR.exe
O4 - HKLM\..\Run: [PRPCMonitor] PRPCUI.exe
O4 - HKLM\..\Run: [TPKMAPMN] C:\Program Files\ThinkPad\Utilities\TpKmapMn.exe
O4 - HKLM\..\Run: [SoundMAXPnP] C:\Program Files\Analog Devices\SoundMAX\SMax4PNP.exe
O4 - HKLM\..\Run: [TP4EX] tp4ex.exe
O4 - HKLM\..\Run: [ACUMon] "C:\Program Files\Cisco Systems\Aironet Client Monitor\ACUMon.Exe" -a
O4 - HKLM\..\Run: [PRISMSTA.EXE] PRISMSTA.EXE
O4 - HKLM\..\Run: [LVCOMSX] C:\WINNT\system32\LVCOMSX.EXE
O4 - HKLM\..\Run: [ANIWZCS2Service] C:\Program Files\ANI\ANIWZCS2 Service\WZCSLDR2.exe
O4 - HKLM\..\Run: [ShStatEXE] "C:\Program Files\Network Associates\VirusScan\SHSTAT.EXE" /STANDALONE
O4 - HKLM\..\Run: [McAfeeUpdaterUI] "C:\Program Files\Network Associates\Common Framework\UpdaterUI.exe" /StartedFromRunKey
O4 - HKLM\..\Run: [Network Associates Error Reporting Service] "C:\Program Files\Fichiers communs\Network Associates\TalkBack\TBMon.exe"
O4 - HKLM\..\Run: [Synchronization Manager] mobsync.exe /logon
O4 - HKLM\..\Run: [SoundMax] "C:\Program Files\Analog Devices\SoundMAX\smax4.exe" /tray
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\MSN Messenger\msnmsgr.exe" /background
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://download.microsoft.com/download/E/5/6/E5611B10-0D6D-4117-8430-A67417AA88CD/LegitCheckControl.cab
O16 - DPF: {30528230-99f7-4bb4-88d8-fa1d4f56a2ab} (YInstStarter Class) - C:\Program Files\Yahoo!\Common\yinsthelper.dll
O16 - DPF: {5D86DDB5-BDF9-441B-9E9E-D4730F4EE499} (BDSCANONLINE Control) - http://download.bitdefender.com/resources/scan8/oscan8.cab
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FICHIE~1\Skype\SKYPE4~1.DLL
O20 - AppInit_DLLs: MsgPlusLoader.dll
O20 - Winlogon Notify: nwprovau - C:\WINNT\SYSTEM32\nwprovau.dll
O20 - Winlogon Notify: tpfnf2 - C:\WINNT\SYSTEM32\notifyf2.dll
O20 - Winlogon Notify: tphotkey - C:\WINNT\SYSTEM32\tphklock.dll
O23 - Service: a-squared Free Service (a2free) - Emsi Software GmbH - C:\Program Files\a-squared Free\a2service.exe
O23 - Service: ANIWZCSd Service (ANIWZCSdService) - Alpha Networks Inc. - C:\Program Files\ANI\ANIWZCS2 Service\ANIWZCSdS.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINNT\system32\Ati2evxx.exe
O23 - Service: Service d'administration du Gestionnaire de disque logique (dmadmin) - VERITAS Software Corp. - C:\WINNT\System32\dmadmin.exe
O23 - Service: ThinkPad PM Service (IBMPMSVC) - Lenovo - C:\WINNT\system32\ibmpmsvc.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Fichiers communs\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: Service Framework McAfee (McAfeeFramework) - Network Associates, Inc. - C:\Program Files\Network Associates\Common Framework\FrameworkService.exe
O23 - Service: Network Associates McShield (McShield) - Network Associates, Inc. - C:\Program Files\Network Associates\VirusScan\Mcshield.exe
O23 - Service: Network Associates Task Manager (McTaskManager) - Network Associates, Inc. - C:\Program Files\Network Associates\VirusScan\VsTskMgr.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINNT\SYSTEM32\SPOOL\DRIVERS\W32X86\3\HPZipm12.exe
O23 - Service: RegSrvc - Intel Corporation - C:\WINNT\System32\RegSrvc.exe
O23 - Service: Spectrum24 Event Monitor (S24EventMonitor) - Intel Corporation - C:\WINNT\System32\S24EvMon.exe
O23 - Service: SoundMAX Agent Service (SoundMAX Agent Service (default)) - Analog Devices, Inc. - C:\Program Files\Analog Devices\SoundMAX\SMAgent.exe
O23 - Service: IBM KCU Service (TpKmpSVC) - Unknown owner - C:\WINNT\system32\TpKmpSVC.exe