50% de la ram utilisée sans rien d'ouvert

Bonjour,
J'ai actuellement un core 2 duo T5250 sous vista
et mon problème c'est que 50% de la ram est utilisée sans qu'aucun programme ne tourne...
J'ai utilisé malwarebytes' antimalware mais il ne détecte rien d'anormal.
Pourriez-vous s'il vous plait me venir en aide ça serait très gentil

J'oubliais, j'ai un petit cadeau pour vous:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 21:24:30, on 04/09/2008
Platform: Windows Vista SP1 (WinNT 6.00.1905)
MSIE: Internet Explorer v7.00 (7.00.6001.18000)
Boot mode: Normal

Running processes:
C:\Windows\system32\Dwm.exe
C:\Windows\system32\taskeng.exe
C:\Windows\Explorer.EXE
C:\Program Files\Windows Defender\MSASCui.exe
C:\Program Files\Windows Media Player\wmpnscfg.exe
C:\Windows\system32\wbem\unsecapp.exe
C:\Program Files\TOSHIBA\Utilities\KeNotify.exe
C:\Windows\RtHDVCpl.exe
C:\Program Files\TOSHIBA\SmoothView\SmoothView.exe
C:\Program Files\TOSHIBA\FlashCards\TCrdMain.exe
C:\Program Files\TOSHIBA\ConfigFree\NDSTray.exe
C:\Program Files\IDM\Desktop SMS\DesktopSMS.exe
C:\Program Files\Camera Assistant Software for Toshiba\traybar.exe
C:\Program Files\Intel\Intel Matrix Storage Manager\IAAnotif.exe
C:\Program Files\Toshiba TEMPO\Toshiba.Tempo.UI.TrayApplication.exe
C:\Program Files\Winamp\winampa.exe
C:\Program Files\On Demand Distribution\OD2 Music Manager\OD2MediaBar_VistaFileManager.exe
C:\Program Files\Java\jre1.6.0_07\bin\jusched.exe
C:\Program Files\Windows Sidebar\sidebar.exe
C:\Program Files\TOSHIBA\TOSCDSPD\TOSCDSPD.exe
C:\Windows\ehome\ehtray.exe
C:\Program Files\Toshiba\Bluetooth Toshiba Stack\TosBtMng.exe
C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\MOM.EXE
C:\Program Files\OpenOffice.org 2.4\program\soffice.exe
C:\Windows\ehome\ehmsas.exe
C:\Program Files\Camera Assistant Software for Toshiba\CEC_MAIN.exe
C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
C:\Program Files\OpenOffice.org 2.4\program\soffice.BIN
C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\CCC.exe
C:\Program Files\Synaptics\SynTP\SynToshiba.exe
C:\Program Files\TOSHIBA\ConfigFree\CFSwMgr.exe
C:\Program Files\Windows Mail\WinMail.exe
c:\Program Files\Toshiba\Bluetooth Toshiba Stack\TosA2dp.exe
c:\Program Files\Toshiba\Bluetooth Toshiba Stack\TosBtHid.exe
c:\Program Files\Toshiba\Bluetooth Toshiba Stack\TosBtHsp.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Windows\system32\conime.exe
C:\Windows\system32\NOTEPAD.EXE
C:\Program Files\Malwarebytes' Anti-Malware\mbam.exe
C:\Windows\system32\NOTEPAD.EXE
C:\Windows\system32\NOTEPAD.EXE
C:\Windows\system32\taskeng.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe
C:\Windows\system32\SearchFilterHost.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.google.fr/?gws_rd=ssl
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = https://www.msn.com/fr-fr/?ocid=iehp
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.msn.com/fr-fr/?ocid=iehp
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
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: Skype add-on (mastermind) - {22BF413B-C6D2-4d91-82A9-A0F997BA588C} - C:\Program Files\Skype\Toolbars\Internet Explorer\SkypeIEPlugin.dll
O2 - BHO: RealPlayer Download and Record Plugin for Internet Explorer - {3049C3E9-B461-4BC5-8870-4C09146192CA} - C:\Program Files\Real\RealPlayer\rpbrowserrecordplugin.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_07\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Programme d'aide de l'Assistant de connexion Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O4 - HKLM\..\Run: [Windows Defender] %ProgramFiles%\Windows Defender\MSASCui.exe -hide
O4 - HKLM\..\Run: [KeNotify] C:\Program Files\TOSHIBA\Utilities\KeNotify.exe
O4 - HKLM\..\Run: [SVPWUTIL] C:\Program Files\TOSHIBA\Utilities\SVPWUTIL.exe SVPwUTIL
O4 - HKLM\..\Run: [HWSetup] \HWSetup.exe hwSetUP
O4 - HKLM\..\Run: [RtHDVCpl] RtHDVCpl.exe
O4 - HKLM\..\Run: [TPwrMain] %ProgramFiles%\TOSHIBA\Power Saver\TPwrMain.EXE
O4 - HKLM\..\Run: [HSON] %ProgramFiles%\TOSHIBA\TBS\HSON.exe
O4 - HKLM\..\Run: [SmoothView] %ProgramFiles%\Toshiba\SmoothView\SmoothView.exe
O4 - HKLM\..\Run: [00TCrdMain] %ProgramFiles%\TOSHIBA\FlashCards\TCrdMain.exe
O4 - HKLM\..\Run: [NDSTray.exe] NDSTray.exe
O4 - HKLM\..\Run: [Desktop SMS] C:\Program Files\IDM\Desktop SMS\DesktopSMS.exe /auto
O4 - HKLM\..\Run: [topi] C:\Program Files\TOSHIBA\Toshiba Online Product Information\topi.exe -startup
O4 - HKLM\..\Run: [Skytel] Skytel.exe
O4 - HKLM\..\Run: [Camera Assistant Software] "C:\Program Files\Camera Assistant Software for Toshiba\traybar.exe"
O4 - HKLM\..\Run: [SynTPStart] C:\Program Files\Synaptics\SynTP\SynTPStart.exe
O4 - HKLM\..\Run: [Toshiba Registration] C:\Program Files\Toshiba\Registration\ToshibaRegistration.exe
O4 - HKLM\..\Run: [IAAnotif] C:\Program Files\Intel\Intel Matrix Storage Manager\iaanotif.exe
O4 - HKLM\..\Run: [Toshiba TEMPO] C:\Program Files\Toshiba TEMPO\Toshiba.Tempo.UI.TrayApplication.exe
O4 - HKLM\..\Run: [WinampAgent] "C:\Program Files\Winamp\winampa.exe"
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [MediaBarFileManager] C:\Program Files\On Demand Distribution\OD2 Music Manager\OD2MediaBar_VistaFileManager.exe
O4 - HKLM\..\Run: [UVS11 Preload] C:\Program Files\Ulead Systems\Ulead VideoStudio 11\uvPL.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_07\bin\jusched.exe"
O4 - HKLM\..\Run: [StartCCC] "C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\CLIStart.exe"
O4 - HKLM\..\Run: [Symantec PIF AlertEng] "C:\Program Files\Common Files\Symantec Shared\PIF\{B8E1DD85-8582-4c61-B58F-2F227FCA9A08}\PIFSvc.exe" /a /m "C:\Program Files\Common Files\Symantec Shared\PIF\{B8E1DD85-8582-4c61-B58F-2F227FCA9A08}\AlertEng.dll"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\QTTask.exe" -atboottime
O4 - HKLM\..\RunOnce: [isDeleteMe] "C:\Windows\system32\cmd.exe" /c "C:\Users\Mustapha\AppData\Local\Temp\isDel.bat"
O4 - HKCU\..\Run: [Sidebar] C:\Program Files\Windows Sidebar\sidebar.exe /autoRun
O4 - HKCU\..\Run: [TOSCDSPD] C:\Program Files\TOSHIBA\TOSCDSPD\TOSCDSPD.exe
O4 - HKCU\..\Run: [ehTray.exe] C:\Windows\ehome\ehTray.exe
O4 - HKCU\..\Run: [WMPNSCFG] C:\Program Files\Windows Media Player\WMPNSCFG.exe
O4 - HKUS\S-1-5-19\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /detectMem (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-19\..\Run: [WindowsWelcomeCenter] rundll32.exe oobefldr.dll,ShowWelcomeCenter (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /detectMem (User 'SERVICE RÉSEAU')
O4 - Startup: Adobe Gamma.lnk = C:\Program Files\Common Files\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Startup: OpenOffice.org 2.4.lnk = C:\Program Files\OpenOffice.org 2.4\program\quickstart.exe
O4 - Global Startup: Bluetooth Manager.lnk = ?
O4 - Global Startup: Lancement rapide d'Adobe Reader.lnk = C:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_07\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_07\bin\ssv.dll
O9 - Extra button: eBay - Achetez, Vendez - {76577871-04EC-495E-A12B-91F7C3600AFA} - https://www.ebay.fr (file missing)
O9 - Extra button: Skype - {77BF5300-1474-4EC7-9980-D32B190E9B07} - C:\Program Files\Skype\Toolbars\Internet Explorer\SkypeIEPlugin.dll
O9 - Extra button: Amazon.fr - {8A918C1D-E123-4E36-B562-5C1519E434CE} - https://www.amazon.fr/exec/obidos/subst/home/home.html/262-6263521-6325360?_encoding=UTF8&link_code=hom&tag=Toshibafrbholink-21 (file missing)
O9 - Extra button: eBay - {C08CAF1D-C0A3-40D5-9970-06D067EAC017} - http://www.webtip.ch/cgi-bin/toshiba/tracker_url.pl?FR (file missing)
O13 - Gopher Prefix:
O16 - DPF: {C3F79A2B-B9B4-4A66-B012-3EE46475B072} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsPAClient.cab56907.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/swflash.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{346AB5F5-6446-41E5-BF09-51CFD4F2C733}: NameServer = 192.168.1.1,192.168.1.2
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\COMMON~1\Skype\SKYPE4~1.DLL
O23 - Service: Adobe LM Service - Adobe Systems - C:\Program Files\Common Files\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: Agere Modem Call Progress Audio (AgereModemAudio) - Agere Systems - C:\Windows\system32\agrsmsvc.exe
O23 - Service: Ati External Event Utility - ATI Technologies Inc. - C:\Windows\system32\Ati2evxx.exe
O23 - Service: Capture Device Service - InterVideo Inc. - C:\Program Files\Common Files\InterVideo\DeviceService\DevSvc.exe
O23 - Service: ConfigFree Service (CFSvcs) - TOSHIBA CORPORATION - C:\Program Files\TOSHIBA\ConfigFree\CFSvcs.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\11\Intel 32\IDriverT.exe
O23 - Service: LiveUpdate - Symantec Corporation - C:\PROGRA~1\Symantec\LIVEUP~1\LUCOMS~1.EXE
O23 - Service: LiveUpdate Notice Service Ex (LiveUpdate Notice Ex) - Unknown owner - C:\Program Files\Common Files\Symantec Shared\ccSvcHst.exe (file missing)
O23 - Service: LiveUpdate Notice Service - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\PIF\{B8E1DD85-8582-4c61-B58F-2F227FCA9A08}\PIFSvc.exe
O23 - Service: Lookout Citadel Server (LkCitadelServer) - National Instruments, Inc. - C:\Windows\system32\lkcitdl.exe
O23 - Service: National Instruments PSP Server Locator (lkClassAds) - National Instruments Corporation - C:\Windows\system32\lkads.exe
O23 - Service: National Instruments Time Synchronization (lkTimeSync) - National Instruments Corporation - C:\Windows\system32\lktsrv.exe
O23 - Service: NI Configuration Manager (mxssvr) - National Instruments Corporation - C:\Program Files\National Instruments\MAX\nimxs.exe
O23 - Service: National Instruments Domain Service (NIDomainService) - National Instruments Corporation - C:\Program Files\National Instruments\Shared\Security\nidmsrv.exe
O23 - Service: NI Service Locator (niSvcLoc) - National Instruments Corp. - C:\Windows\system32\nisvcloc.exe
O23 - Service: National Instruments Variable Engine (NITaggerService) - National Instruments Corporation - C:\Program Files\National Instruments\Shared\Tagger\tagsrv.exe
O23 - Service: OpcEnum - OPC Foundation - C:\Windows\system32\OpcEnum.exe
O23 - Service: Planificateur LiveUpdate automatique - Symantec Corporation - C:\Program Files\Symantec\LiveUpdate\ALUSchedulerSvc.exe
O23 - Service: Notebook Performance Tuning Service (TempoMonitoringService) - Toshiba Europe GmbH - C:\Program Files\Toshiba TEMPO\TempoSVC.exe
O23 - Service: TOSHIBA Navi Support Service (TNaviSrv) - TOSHIBA Corporation - C:\Program Files\TOSHIBA\TOSHIBA HD DVD PLAYER\TNaviSrv.exe
O23 - Service: TOSHIBA Optical Disc Drive Service (TODDSrv) - TOSHIBA Corporation - C:\Windows\system32\TODDSrv.exe
O23 - Service: TOSHIBA Power Saver (TosCoSrv) - TOSHIBA Corporation - C:\Program Files\TOSHIBA\Power Saver\TosCoSrv.exe
O23 - Service: TOSHIBA Bluetooth Service - TOSHIBA CORPORATION - c:\Program Files\Toshiba\Bluetooth Toshiba Stack\TosBtSrv.exe
O23 - Service: Ulead Burning Helper (UleadBurningHelper) - Ulead Systems, Inc. - C:\Program Files\Common Files\Ulead Systems\DVD\ULCDRSvr.exe