Mon ordinateur ralentit et bug beaucoup >_<

Bonjour à tous,
J'ai un ordinateur qui tourne sous Vista et depuis quelques temps, il démarre de plus en plus lentement, ralentit... je ne peux même plus lire de vidéos tellement il est lent ! >_<
j'ai un peu parcouru les forums déjà présents ici, mais je n'arrive pas à déterminer mon problème... Les scans en ligne ne fonctionnent pas pour moi, j'ai l'impression que j'ai des fichiers infectés, ou des fichiers manquants mais je ne sais pas lesquels...
Si quelqu'un aurait le temps et la gentillesse de se pencher sur mon problème, je lui en serait très reconnaissante TT_TT
J'ai aussi lancer le fameux 'hijackthis", dont voilà le log:

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Logfile of HijackThis v1.99.1
Scan saved at 22:13:10, on 06/02/2008
Platform: Unknown Windows (WinNT 6.00.1904)
MSIE: Internet Explorer v7.00 (7.00.6000.16575)

Running processes:
C:\Windows\system32\taskeng.exe
C:\Windows\system32\Dwm.exe
C:\Windows\Explorer.EXE
C:\Program Files\CA\CA Internet Security Suite\CA Personal Firewall\capfsem.exe
C:\Program Files\Windows Defender\MSASCui.exe
C:\hp\support\hpsysdrv.exe
C:\hp\KBD\kbd.exe
C:\Program Files\Hewlett-Packard\HP Software Update\hpwuSchd2.exe
C:\Program Files\Winamp\winampa.exe
C:\Program Files\Java\jre1.6.0_03\bin\jusched.exe
C:\Program Files\Intel\Intel Matrix Storage Manager\IAAnotif.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\Windows\System32\rundll32.exe
C:\Program Files\CA\CA Internet Security Suite\cctray\cctray.exe
C:\Program Files\CA\CA Internet Security Suite\CA Anti-Virus\cavrid.exe
C:\Program Files\CA\CA Internet Security Suite\CA Personal Firewall\capfasem.exe
C:\Program Files\Samsung\Samsung Media Studio 5\SMSTray.exe
C:\Program Files\Windows Sidebar\sidebar.exe
C:\Windows\ehome\ehtray.exe
C:\Program Files\Windows Media Player\wmpnscfg.exe
C:\Windows\ehome\ehmsas.exe
C:\Program Files\Hewlett-Packard\Digital Imaging\bin\hpqtra08.exe
C:\Program Files\Last.fm\LastFMHelper.exe
C:\Program Files\CA\CA Internet Security Suite\CA Anti-Spyware\CAPPActiveProtection.exe
C:\Program Files\Hewlett-Packard\Digital Imaging\bin\hpqSTE08.exe
C:\Program Files\K-Lite Codec Pack\Media Player Classic\mplayerc.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\CA\CA Internet Security Suite\ccupdate\CCUpdate.exe
C:\Program Files\CA\CA Internet Security Suite\CA Personal Firewall\cafw.exe
C:\Users\Kisa&Sanae\Desktop\Only Shoujo website\hijackthis_199\HijackThis.exe
C:\Windows\system32\conime.exe
C:\Windows\System32\cmd.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://runonce.msn.com/?v=msgrv75
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://ie.redirect.hp.com/...
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://ie.redirect.hp.com/...
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = localhost;*.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O1 - Hosts: ::1 localhost
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar2.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar2.dll
O4 - HKLM\..\Run: [Windows Defender] %ProgramFiles%\Windows Defender\MSASCui.exe -hide
O4 - HKLM\..\Run: [hpsysdrv] c:\hp\support\hpsysdrv.exe
O4 - HKLM\..\Run: [KBD] C:\HP\KBD\KBD.EXE
O4 - HKLM\..\Run: [HP Software Update] C:\Program Files\Hewlett-Packard\HP Software Update\HPWuSchd2.exe
O4 - HKLM\..\Run: [WinampAgent] C:\Program Files\Winamp\winampa.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_03\bin\jusched.exe"
O4 - HKLM\..\Run: [NvSvc] RUNDLL32.EXE C:\Windows\system32\nvsvc.dll,nvsvcStart
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\Windows\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\Windows\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [IAAnotif] "C:\Program Files\Intel\Intel Matrix Storage Manager\Iaanotif.exe"
O4 - HKLM\..\Run: [MBBalloon] C:\Program Files\HOTALBUMMyBOX\MBBalloon.exe
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\QTTask.exe" -atboottime
O4 - HKLM\..\Run: [cctray] "C:\Program Files\CA\CA Internet Security Suite\cctray\cctray.exe"
O4 - HKLM\..\Run: [CAVRID] "C:\Program Files\CA\CA Internet Security Suite\CA Anti-Virus\CAVRID.exe"
O4 - HKLM\..\Run: [cafwc] C:\Program Files\CA\CA Internet Security Suite\CA Personal Firewall\cafw.exe -cl
O4 - HKLM\..\Run: [capfasem] C:\Program Files\CA\CA Internet Security Suite\CA Personal Firewall\capfasem.exe
O4 - HKLM\..\Run: [SMSTray] C:\Program Files\Samsung\Samsung Media Studio 5\SMSTray.exe
O4 - HKLM\..\RunOnce: [Launcher] %WINDIR%\SMINST\launcher.exe
O4 - HKCU\..\Run: [Sidebar] C:\Program Files\Windows Sidebar\sidebar.exe /autoRun
O4 - HKCU\..\Run: [ehTray.exe] C:\Windows\ehome\ehTray.exe
O4 - HKCU\..\Run: [Skype] "C:\Program Files\Skype\Phone\Skype.exe" /nosplash /minimized
O4 - HKCU\..\Run: [Evidence Eliminator] C:\Program Files\Evidence Eliminator\ee.exe /m
O4 - HKCU\..\Run: [WMPNSCFG] C:\Program Files\Windows Media Player\WMPNSCFG.exe
O4 - HKCU\..\Run: [RamCleaner] C:\Program Files\RamCleaner\RamCleaner.exe -s
O4 - Startup: IMVU.lnk = C:\Program Files\IMVU\IMVUClient.exe
O4 - Startup: Last.fm Helper.lnk = C:\Program Files\Last.fm\LastFMHelper.exe
O4 - Global Startup: HP Digital Imaging Monitor.lnk = C:\Program Files\Hewlett-Packard\Digital Imaging\bin\hpqtra08.exe
O4 - Global Startup: MediaChecker.lnk = C:\Program Files\HOTALBUMMyBOX\MediaChecker.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~3\Office12\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~3\Office12\REFIEBAR.DLL
O9 - Extra button: Run IMVU - {d9288080-1baa-4bc4-9cf8-a92d743db949} - C:\Users\Kisa&Sanae\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\>IMVU\Run IMVU.lnk (file missing)
O10 - Unknown file in Winsock LSP: c:\windows\system32\nlaapi.dll
O10 - Unknown file in Winsock LSP: c:\windows\system32\napinsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\bonjour\mdnsnsp.dll
O11 - Options group: [INTERNATIONAL] International*
O13 - Gopher Prefix:
O16 - DPF: {072039AB-2117-4ED5-A85F-9B9EB903E021} (NowStarter Control) - http://www.clubbox.co.kr/neo.fld/NowStarter.cab
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: ms-help - {314111C7-A502-11D2-BBCA-00C04F8EC294} - C:\Program Files\Common Files\Microsoft Shared\Help\hxds.dll
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Filter hijack: text/xml - {807563E5-5146-11D5-A672-00B0D022E945} - C:\PROGRA~1\COMMON~1\MICROS~1\OFFICE12\MSOXMLMF.DLL
O20 - Winlogon Notify: PFW - C:\Windows\SYSTEM32\UmxWnp.Dll
O23 - Service: Ad-Aware 2007 Service (aawservice) - Lavasoft AB - C:\Program Files\Lavasoft\Ad-Aware 2007\aawservice.exe
O23 - Service: ##Id_String1.6844F930_1628_4223_B5CC_5BB94B879762## (Bonjour Service) - Apple Computer, Inc. - C:\Program Files\Bonjour\mDNSResponder.exe
O23 - Service: CaCCProvSP - CA, Inc. - C:\Program Files\CA\CA Internet Security Suite\ccprovsp.exe
O23 - Service: CAISafe - Computer Associates International, Inc. - C:\Program Files\CA\CA Internet Security Suite\CA Anti-Virus\ISafe.exe
O23 - Service: Symantec Lic NetConnect service (CLTNetCnService) - Unknown owner - c:\Program Files\Common Files\Symantec Shared\ccSvcHst.exe" /h ccCommon (file missing)
O23 - Service: @%SystemRoot%\ehome\ehstart.dll,-101 (ehstart) - Unknown owner - %windir%\system32\svchost.exe (file missing)
O23 - Service: FLEXnet Licensing Service - Macrovision Europe Ltd. - C:\Program Files\Common Files\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: Intel(R) Matrix Storage Event Monitor (IAANTMON) - Intel Corporation - C:\Program Files\Intel\Intel Matrix Storage Manager\Iaantmon.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: CA Pest Patrol Realtime Protection Service (ITMRTSVC) - CA, Inc. - C:\Program Files\CA\SharedComponents\PPRT\bin\ITMRTSVC.exe
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Hewlett-Packard Company - c:\Program Files\Common Files\LightScribe\LSSrvc.exe
O23 - Service: LiveUpdate - Symantec Corporation - C:\PROGRA~1\Symantec\LIVEUP~1\LUCOMS~1.EXE
O23 - Service: MSCSPTISRV - Sony Corporation - C:\Program Files\Common Files\Sony Shared\AVLib\MSCSPTISRV.exe
O23 - Service: PACSPTISVR - Unknown owner - C:\Program Files\Common Files\Sony Shared\AVLib\PACSPTISVR.exe
O23 - Service: Planificateur LiveUpdate automatique - Symantec Corporation - C:\Program Files\Symantec\LiveUpdate\ALUSchedulerSvc.exe
O23 - Service: PPCtlPriv - CA, Inc. - C:\Program Files\CA\CA Internet Security Suite\CA Anti-Spyware\PPCtlPriv.exe
O23 - Service: @%SystemRoot%\system32\qwave.dll,-1 (QWAVE) - Unknown owner - %windir%\system32\svchost.exe (file missing)
O23 - Service: @%SystemRoot%\system32\seclogon.dll,-7001 (seclogon) - Unknown owner - %windir%\system32\svchost.exe (file missing)
O23 - Service: SonicStage Back-End Service - Sony Corporation - C:\Program Files\Common Files\Sony Shared\AVLib\SsBeSvc.exe
O23 - Service: Sony SPTI Service (SPTISRV) - Sony Corporation - C:\Program Files\Common Files\Sony Shared\AVLib\SPTISRV.exe
O23 - Service: SonicStage SCSI Service (SSScsiSV) - Sony Corporation - C:\Program Files\Common Files\Sony Shared\AVLib\SSScsiSV.exe
O23 - Service: stllssvr - MicroVision Development, Inc. - c:\Program Files\Common Files\SureThing Shared\stllssvr.exe
O23 - Service: HIPS Event Manager (UmxAgent) - CA - C:\Program Files\CA\SharedComponents\HIPSEngine\UmxAgent.exe
O23 - Service: HIPS Configuration Interpreter (UmxCfg) - CA - C:\Program Files\CA\SharedComponents\HIPSEngine\UmxCfg.exe
O23 - Service: HIPS Firewall Helper (UmxFwHlp) - CA - C:\Program Files\CA\SharedComponents\HIPSEngine\UmxFwHlp.exe
O23 - Service: HIPS Policy Manager (UmxPol) - CA - C:\Program Files\CA\SharedComponents\HIPSEngine\UmxPol.exe
O23 - Service: VET Message Service (VETMSGNT) - CA, Inc. - C:\Program Files\CA\CA Internet Security Suite\CA Anti-Virus\VetMsg.exe
O23 - Service: @%ProgramFiles%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown owner - %ProgramFiles%\Windows Media Player\wmpnetwk.exe (file missing)

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Je ne sais pas si ça peut aider? ....
en tout cas, merci d'avance à ceux qui voudront bien m'aider!
xxxx
Sanae

Configuration: Windows Vista
Firefox 2.0.0.11