Arre^t très lent du pc

salut à tous,
depuis quelque temps le pc m'enerve et il prend beaucoup de temps pour s'arreter, j'ai windows vista et antivir.
je me demande si vous pouvait m'aider a regler le pb
merci

voici le log hijackThis:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 23:41:19, on 03/10/2008
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\taskeng.exe
C:\Windows\system32\Dwm.exe
C:\Windows\Explorer.EXE
C:\Program Files\Windows Defender\MSASCui.exe
C:\Windows\RtHDVCpl.exe
C:\Acer\Empowering Technology\SysMonitor.exe
C:\Acer\Empowering Technology\eDataSecurity\x86\eDSLoader.exe
C:\Program Files\Acer Arcade Live\Acer HomeMedia Connect\Kernel\DMS\PCMMediaSharing.exe
C:\Windows\System32\rundll32.exe
C:\Windows\System32\nvraidservice.exe
C:\Windows\tsnp2std.exe
C:\Program Files\ESET\ESET Smart Security\egui.exe
C:\Program Files\BitComet\BitComet.exe
C:\Program Files\ooVoo\ooVoo.exe
C:\Windows\System32\rundll32.exe
C:\Program Files\Windows Media Player\wmpnscfg.exe
C:\Program Files\Skype\Phone\Skype.exe
C:\Windows\system32\wbem\unsecapp.exe
C:\Acer\Empowering Technology\ACER.EMPOWERING.FRAMEWORK.SUPERVISOR.EXE
C:\Acer\Empowering Technology\eRecovery\ERAGENT.EXE
C:\Windows\system32\wuauclt.exe
C:\Program Files\Skype\Plugin Manager\skypePM.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\Winamp\winamp.exe
C:\Windows\system32\conime.exe
C:\Windows\explorer.exe
C:\Windows\System32\mobsync.exe
C:\Users\username\Downloads\RSIT.exe
C:\Program Files\Trend Micro\HijackThis\ben khediri ramzi.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://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://fr.fr.acer.yahoo.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
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://fr.fr.acer.yahoo.com
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
R3 - URLSearchHook: (no name) - {0579B4B6-0293-4d73-B02D-5EBB0BA0F0A2} - C:\Program Files\AskSBar\SrchAstt\1.bin\A2SRCHAS.DLL
R3 - URLSearchHook: P2P Torrent Toolbar - {bc4be15d-6a34-4356-9e97-79e43da32b1d} - C:\Program Files\P2P_Torrent\tbP2P_.dll
R3 - URLSearchHook: Best Security Tips Toolbar - {da30eff8-ccc6-4162-a20d-67402a26a215} - C:\Program Files\Best_Security_Tips\tbBes0.dll
F2 - REG:system.ini: UserInit=userinit.exe
O1 - Hosts: ::1 localhost
O2 - BHO: &Yahoo! Toolbar Helper - {02478D38-C3F9-4efb-9B51-7695ECA05670} - C:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll
O2 - BHO: Ask Search Assistant BHO - {0579B4B1-0293-4d73-B02D-5EBB0BA0F0A2} - C:\Program Files\AskSBar\SrchAstt\1.bin\A2SRCHAS.DLL
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: BitComet ClickCapture - {39F7E362-828A-4B5A-BCAF-5B79BFDFEA60} - C:\Program Files\BitComet\tools\BitCometBHO_1.2.6.26.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_07\bin\ssv.dll
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
O2 - BHO: P2P Torrent Toolbar - {bc4be15d-6a34-4356-9e97-79e43da32b1d} - C:\Program Files\P2P_Torrent\tbP2P_.dll
O2 - BHO: FDMIECookiesBHO Class - {CC59E0F9-7E43-44FA-9FAA-8377850BF205} - C:\Program Files\Free Download Manager\iefdm2.dll
O2 - BHO: Best Security Tips Toolbar - {da30eff8-ccc6-4162-a20d-67402a26a215} - C:\Program Files\Best_Security_Tips\tbBes0.dll
O2 - BHO: Ask Toolbar BHO - {F0D4B231-DA4B-4daf-81E4-DFEE4931A4AA} - C:\Program Files\AskSBar\bar\1.bin\ASKSBAR.DLL
O3 - Toolbar: Acer eDataSecurity Management - {5CBE3B7C-1E47-477e-A7DD-396DB0476E29} - C:\Acer\Empowering Technology\eDataSecurity\x86\eDStoolbar.dll
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll
O3 - Toolbar: (no name) - {0BF43445-2F28-4351-9252-17FE6E806AA0} - (no file)
O3 - Toolbar: Ask Toolbar - {F0D4B239-DA4B-4daf-81E4-DFEE4931A4AA} - C:\Program Files\AskSBar\bar\1.bin\ASKSBAR.DLL
O3 - Toolbar: P2P Torrent Toolbar - {bc4be15d-6a34-4356-9e97-79e43da32b1d} - C:\Program Files\P2P_Torrent\tbP2P_.dll
O3 - Toolbar: Best Security Tips Toolbar - {da30eff8-ccc6-4162-a20d-67402a26a215} - C:\Program Files\Best_Security_Tips\tbBes0.dll
O3 - Toolbar: DAEMON Tools Toolbar - {32099AAC-C132-4136-9E9A-4E364A424E17} - C:\Program Files\DAEMON Tools Toolbar\DTToolbar.dll
O4 - HKLM\..\Run: [Windows Defender] %ProgramFiles%\Windows Defender\MSASCui.exe -hide
O4 - HKLM\..\Run: [RtHDVCpl] RtHDVCpl.exe
O4 - HKLM\..\Run: [Acer Empowering Technology Monitor] C:\Acer\Empowering Technology\SysMonitor.exe
O4 - HKLM\..\Run: [eDataSecurity Loader] C:\Acer\Empowering Technology\eDataSecurity\x86\eDSloader.exe
O4 - HKLM\..\Run: [PCMMediaSharing] C:\Program Files\Acer Arcade Live\Acer HomeMedia Connect\Kernel\DMS\PCMMediaSharing.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: [WarReg_PopUp] C:\Acer\WR_PopUp\WarReg_PopUp.exe
O4 - HKLM\..\Run: [NVRaidService] C:\Windows\system32\nvraidservice.exe
O4 - HKLM\..\Run: [Acer Tour Reminder] C:\Acer\AcerTour\Reminder.exe
O4 - HKLM\..\Run: [Apanel] C:\ACERSW\config\NewSetApanel.cmd
O4 - HKLM\..\Run: [tsnp2std] C:\Windows\tsnp2std.exe
O4 - HKLM\..\Run: [egui] "C:\Program Files\ESET\ESET Smart Security\egui.exe" /hide /waitservice
O4 - HKCU\..\Run: [BitComet] "C:\Program Files\BitComet\BitComet.exe" /tray
O4 - HKCU\..\Run: [ooVoo.exe] C:\Program Files\ooVoo\ooVoo.exe /minimized
O4 - HKCU\..\Run: [HijackThis startup scan] C:\Program Files\Trend Micro\HijackThis\HijackThis.exe /startupscan
O4 - HKCU\..\Run: [WMPNSCFG] C:\Program Files\Windows Media Player\WMPNSCFG.exe
O4 - HKCU\..\Run: [Skype] "C:\Program Files\Skype\Phone\Skype.exe" /nosplash /minimized
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 - Global Startup: Empowering Technology Launcher.lnk = ?
O8 - Extra context menu item: &D&ownload &with BitComet - res://C:\Program Files\BitComet\BitComet.exe/AddLink.htm
O8 - Extra context menu item: &D&ownload all video with BitComet - res://C:\Program Files\BitComet\BitComet.exe/AddVideo.htm
O8 - Extra context menu item: &D&ownload all with BitComet - res://C:\Program Files\BitComet\BitComet.exe/AddAllLink.htm
O8 - Extra context menu item: Add to &Teleport - C:\Program Files\Teleport Pro\teleport.htm
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O8 - Extra context menu item: Tout télécharger avec Free Download Manager - file://C:\Program Files\Free Download Manager\dlall.htm
O8 - Extra context menu item: Télécharger avec Free Download Manager - file://C:\Program Files\Free Download Manager\dllink.htm
O8 - Extra context menu item: Télécharger la sélection avec Free Download Manager - file://C:\Program Files\Free Download Manager\dlselected.htm
O8 - Extra context menu item: Télécharger la vidéo avec Free Download Manager - file://C:\Program Files\Free Download Manager\dlfvideo.htm
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\PROGRA~1\Java\JRE16~1.0_0\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\PROGRA~1\Java\JRE16~1.0_0\bin\ssv.dll
O9 - Extra button: Envoyer à OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: &Envoyer à OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\REFIEBAR.DLL
O9 - Extra button: BitComet - {D18A0B52-D63C-4ed0-AFC6-C1E3DC1AF43A} - res://C:\Program Files\BitComet\tools\BitCometBHO_1.2.6.26.dll/206 (file missing)
O13 - Gopher Prefix:
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/swflash.cab
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\COMMON~1\Skype\SKYPE4~1.DLL
O23 - Service: Acer HomeMedia Connect Service - CyberLink - C:\Program Files\Acer Arcade Live\Acer HomeMedia Connect\Kernel\DMS\CLMSServer.exe
O23 - Service: ePerformance Service (AcerMemUsageCheckService) - Unknown owner - C:\Acer\Empowering Technology\ePerformance\MemCheck.exe
O23 - Service: Boonty Games - BOONTY - C:\Program Files\Common Files\BOONTY Shared\Service\Boonty.exe
O23 - Service: eDataSecurity Service - Egis Incorporated - C:\Acer\Empowering Technology\eDataSecurity\x86\eDSService.exe
O23 - Service: Eset HTTP Server (EhttpSrv) - ESET - C:\Program Files\ESET\ESET Smart Security\EHttpSrv.exe
O23 - Service: Eset Service (ekrn) - ESET - C:\Program Files\ESET\ESET Smart Security\ekrn.exe
O23 - Service: eRecovery Service (eRecoveryService) - Acer Inc. - C:\Acer\Empowering Technology\eRecovery\eRecoveryService.exe
O23 - Service: eSettings Service (eSettingsService) - Unknown owner - C:\Acer\Empowering Technology\eSettings\Service\capuserv.exe
O23 - Service: Cordaware InfoServer (InfoServer) - Cordaware - C:\Program Files\Cordaware\Infoband\Infoserver.exe
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Hewlett-Packard Company - C:\Program Files\Common Files\LightScribe\LSSrvc.exe
O23 - Service: MySQL - Unknown owner - C:\Program.exe (file missing)
O23 - Service: NMSAccessU - Unknown owner - C:\Program Files\CDBurnerXP\NMSAccessU.exe
O23 - Service: Cyberlink RichVideo Service(CRVS) (RichVideo) - Unknown owner - C:\Program Files\CyberLink\Shared Files\RichVideo.exe