nettoyer mon pc trop lent

je sollicite votre aide pour m aider a nettoyer mon pc

voici le resultat de hijack
Logfile of HijackThis v1.99.1
Scan saved at 12:59:50, on 31/07/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

Running processes:
F:\WINDOWS\System32\smss.exe
F:\WINDOWS\system32\winlogon.exe
F:\WINDOWS\system32\services.exe
F:\WINDOWS\system32\lsass.exe
F:\WINDOWS\system32\svchost.exe
F:\WINDOWS\System32\svchost.exe
F:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
F:\Program Files\Alwil Software\Avast4\ashServ.exe
F:\WINDOWS\system32\spoolsv.exe
F:\WINDOWS\Explorer.EXE
F:\WINDOWS\system32\svchost.exe
F:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
F:\Program Files\Fichiers communs\Real\Update_OB\realsched.exe
F:\Program Files\QuickTime\qttask.exe
F:\WINDOWS\system32\LVCOMSX.EXE
F:\Program Files\Logitech\Video\LogiTray.exe
F:\Program Files\MSN Apps\Updater\01.02.0002.1001\fr\msnappau.exe
F:\Program Files\MSN Messenger\msnmsgr.exe
F:\Program Files\Logitech\Video\FxSvr2.exe
F:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
F:\Program Files\Alwil Software\Avast4\ashWebSv.exe
F:\WINDOWS\system32\WgaTray.exe
F:\WINDOWS\Explorer.EXE
F:\Program Files\Internet Explorer\iexplore.exe
F:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WLLoginProxy.exe
F:\Program Files\Internet Explorer\iexplore.exe
F:\Documents and Settings\Administrateur\Bureau\++ (5).exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://g.msn.fr/0SEFRFR/SAOS02
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.fr/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.yahoo.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://home.fr.netscape.com/fr/home/winsearch200.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://fr.rd.yahoo.com/customize/i [...] .yahoo.com
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.yahoo.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
R3 - URLSearchHook: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - F:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll
O2 - BHO: Yahoo! Toolbar Helper - {02478D38-C3F9-4EFB-9B51-7695ECA05670} - F:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - F:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: Skype add-on (mastermind) - {22BF413B-C6D2-4d91-82A9-A0F997BA588C} - F:\Program Files\Skype\Toolbars\Internet Explorer\SkypeIEPlugin.dll
O2 - BHO: (no name) - {259F616C-A300-44F5-B04A-ED001A26C85C} - (no file)
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - F:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Windows Live Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - F:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - f:\program files\google\googletoolbar1.dll
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - F:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - f:\program files\google\googletoolbar1.dll
O3 - Toolbar: Barre d'outils MSN - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - F:\Program Files\MSN Toolbar\01.01.2607.0\fr\msntb.dll (file missing)
O4 - HKLM\..\Run: [avast!] F:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [TkBellExe] "F:\Program Files\Fichiers communs\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [QuickTime Task] "F:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [LVCOMSX] F:\WINDOWS\system32\LVCOMSX.EXE
O4 - HKLM\..\Run: [LogitechVideoRepair] F:\Program Files\Logitech\Video\ISStart.exe
O4 - HKLM\..\Run: [LogitechVideoTray] F:\Program Files\Logitech\Video\LogiTray.exe
O4 - HKLM\..\Run: [msnappau] "F:\Program Files\MSN Apps\Updater\01.02.0002.1001\fr\msnappau.exe"
O4 - HKCU\..\Run: [msnmsgr] "F:\Program Files\MSN Messenger\msnmsgr.exe" /background
O4 - HKCU\..\Run: [ccleaner] "F:\Program Files\CCleaner\ccleaner.exe" /AUTO
O4 - HKCU\..\Run: [LDM] C:\Program Files\Logitech\Desktop Messenger\8876480\Program\BackWeb-8876480.exe
O4 - HKCU\..\Run: [LogitechSoftwareUpdate] "F:\Program Files\Logitech\Video\ManifestEngine.exe" boot
O4 - HKCU\..\Run: [updateMgr] "F:\Program Files\Adobe\Acrobat 7.0\Reader\AdobeUpdateManager.exe" AcRdB7_0_8 -reboot 1
O4 - Global Startup: Logitech Desktop Messenger.lnk = C:\Program Files\Logitech\Desktop Messenger\8876480\Program\LDMConf.exe
O8 - Extra context menu item: Add to Windows &Live Favorites - http://favorites.live.com/quickadd.aspx
O9 - Extra button: Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - F:\PROGRA~1\Yahoo!\Common\yhexbmesfr.dll
O9 - Extra 'Tools' menuitem: Yahoo! Messenger - {4528BBE0-4E08-11D5-AD55-00010333D0AD} - F:\PROGRA~1\Yahoo!\Common\yhexbmesfr.dll
O9 - Extra button: Skype - {77BF5300-1474-4EC7-9980-D32B190E9B07} - F:\Program Files\Skype\Toolbars\Internet Explorer\SkypeIEPlugin.dll
O9 - Extra button: (no name) - SolidConverterPDF - (no file) (HKCU)
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - F:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - F:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - F:\PROGRA~1\FICHIE~1\Skype\SKYPE4~1.DLL
O20 - Winlogon Notify: rpcc - F:\WINDOWS\system32\rpcc.dll (file missing)
O20 - Winlogon Notify: WgaLogon - F:\WINDOWS\SYSTEM32\WgaLogon.dll
O23 - Service: Adobe LM Service - Adobe Systems - F:\Program Files\Fichiers communs\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - F:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - ALWIL Software - F:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - F:\Program Files\Alwil Software\Avast4\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - F:\Program Files\Alwil Software\Avast4\ashWebSv.exe" /service (file missing)
O23 - Service: Google Updater Service (gusvc) - Google - F:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: Service de l'iPod (iPod Service) - Unknown owner - F:\Program Files\iPod\bin\iPodService.exe (file missing)