Y a t-il un virus dans mon bestiau?

Bonjour,
Mon PC rame de plus en plus. Ca a commencé il y a un mois et j'ai quasiment tout essayé (a part en racheter un autre), antivirus, antispy, anti tout quasiment. J'ai même été jusqu'à restaurer ma partition C: avec la partition de restauration.
Résultat : nada. J'arrive même pas à lire correctement un film avec WMP et c'est limite avec VLC (voire impossible à certains instants).
Je suis largué, mais complètement là.
Voilà ma config :
TOSHIBA Satellite P500 avec 4Go de Ram et un Intel core2 duo P7450@2.13Ghz. Windows 7 64bits sp1 édition familiale. Je l'ai acheté en novembre 2009 et mon problème est apparu il y a un mois.
Malheureusement, mes compétences s'arrêtent là et j'ai besoin d'un coup de main s'il vous plait.

Voici le log hijackthis, si quelqu'un sait le lire et me dire si il y a un problème :

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 22:37:49, on 31/05/2011
Platform: Unknown Windows (WinNT 6.01.3505 SP1)
MSIE: Internet Explorer v8.00 (8.00.7601.17514)
Boot mode: Normal

Running processes:
C:\Program Files (x86)\TOSHIBA\Toshiba Online Product Information\TOPI.exe
C:\Program Files (x86)\Windows Live\Messenger\msnmsgr.exe
C:\Program Files (x86)\TOSHIBA\TRCMan\TRCMan.exe
C:\Program Files\AVAST Software\Avast\AvastUI.exe
C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe
C:\Program Files (x86)\Philips\Philips Songbird Resources\Autolauncher\PhilipsDeviceListener.exe
C:\Program Files (x86)\OpenOffice.org 3\program\soffice.exe
C:\Program Files (x86)\OpenOffice.org 3\program\soffice.bin
C:\Program Files\TOSHIBA\HDMICtrlMan\HCMSoundChanger.exe
C:\Program Files (x86)\uTorrent\uTorrent.exe
C:\Users\Famille GIMENEZ\Downloads\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://search.conduit.com?SearchSource=10&ctid=CT2851639
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 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page = C:\Windows\SysWOW64\blank.htm
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
R3 - URLSearchHook: (no name) - {05eeb91a-aef7-4f8a-978f-fb83e7b03f8e} - (no file)
F2 - REG:system.ini: UserInit=userinit.exe
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files (x86)\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: avast! WebRep - {8E5E2654-AD2D-48bf-AC2D-D17F00898D06} - C:\Program Files\AVAST Software\Avast\aswWebRepIE.dll
O2 - BHO: Programme d'aide de l'Assistant de connexion Windows Live ID - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Windows Live Messenger Companion Helper - {9FDDE16B-836F-4806-AB1F-1455CBEFF289} - C:\Program Files (x86)\Windows Live\Companion\companioncore.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files (x86)\Java\jre6\bin\jp2ssv.dll
O3 - Toolbar: avast! WebRep - {8E5E2654-AD2D-48bf-AC2D-D17F00898D06} - C:\Program Files\AVAST Software\Avast\aswWebRepIE.dll
O4 - HKLM\..\Run: [TUSBSleepChargeSrv] %ProgramFiles(x86)%\TOSHIBA\TOSHIBA USB Sleep and Charge Utility\TUSBSleepChargeSrv.exe
O4 - HKLM\..\Run: [ToshibaServiceStation] "C:\Program Files (x86)\TOSHIBA\TOSHIBA Service Station\ToshibaServiceStation.exe" /hide:60
O4 - HKLM\..\Run: [TRCMan] C:\Program Files (x86)\TOSHIBA\TRCMan\TRCMan.exe
O4 - HKLM\..\Run: [TWebCamera] "%ProgramFiles%\TOSHIBA\TOSHIBA Web Camera Application\TWebCamera.exe" autorun
O4 - HKLM\..\Run: [avast] "C:\Program Files\AVAST Software\Avast\avastUI.exe" /nogui
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files (x86)\Adobe\Reader 9.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [Adobe ARM] "C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\AdobeARM.exe"
O4 - HKLM\..\Run: [Philips Device Listener] "C:\Program Files (x86)\Philips\Philips Songbird Resources\Autolauncher\PhilipsDeviceListener.exe"
O4 - HKCU\..\Run: [TOSHIBA Online Product Information] C:\Program Files (x86)\TOSHIBA\Toshiba Online Product Information\topi.exe
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files (x86)\Windows Live\Messenger\msnmsgr.exe" /background
O4 - HKCU\..\Run: [Google Update] "C:\Users\Famille GIMENEZ\AppData\Local\Google\Update\GoogleUpdate.exe" /c
O4 - HKUS\S-1-5-19\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-19\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-20\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-21-2140244253-1891495320-612558327-1003\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'UpdatusUser')
O4 - HKUS\S-1-5-21-2140244253-1891495320-612558327-1003\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'UpdatusUser')
O4 - HKUS\S-1-5-18\..\Run: [TOSHIBA Online Product Information] C:\Program Files (x86)\TOSHIBA\Toshiba Online Product Information\topi.exe (User 'Système')
O4 - HKUS\.DEFAULT\..\Run: [TOSHIBA Online Product Information] C:\Program Files (x86)\TOSHIBA\Toshiba Online Product Information\topi.exe (User 'Default user')
O4 - S-1-5-21-2140244253-1891495320-612558327-1003 User Startup: TRDCReminder.lnk = C:\Program Files (x86)\TOSHIBA\TRDCReminder\TRDCReminder.exe (User 'UpdatusUser')
O4 - .DEFAULT User Startup: TRDCReminder.lnk = C:\Program Files (x86)\TOSHIBA\TRDCReminder\TRDCReminder.exe (User 'Default user')
O4 - Startup: OpenOffice.org 3.3.lnk = C:\Program Files (x86)\OpenOffice.org 3\program\quickstart.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~2\MICROS~1\Office12\EXCEL.EXE/3000
O9 - Extra button: @C:\Program Files (x86)\Windows Live\Companion\companionlang.dll,-600 - {0000036B-C524-4050-81A0-243669A86B9F} - C:\Program Files (x86)\Windows Live\Companion\companioncore.dll
O9 - Extra button: @C:\Program Files (x86)\Windows Live\Writer\WindowsLiveWriterShortcuts.dll,-1004 - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Program Files (x86)\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra 'Tools' menuitem: @C:\Program Files (x86)\Windows Live\Writer\WindowsLiveWriterShortcuts.dll,-1003 - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Program Files (x86)\Windows Live\Writer\WriterBrowserExtension.dll
O10 - Unknown file in Winsock LSP: c:\program files (x86)\common files\microsoft shared\windows live\wlidnsp.dll
O10 - Unknown file in Winsock LSP: c:\program files (x86)\common files\microsoft shared\windows live\wlidnsp.dll
O13 - Gopher Prefix:
O18 - Protocol: wlpg - {E43EF6CD-A37A-4A9B-9E6F-83F89B8E6324} - C:\Program Files (x86)\Windows Live\Photo Gallery\AlbumDownloadProtocolHandler.dll
O23 - Service: @%SystemRoot%\system32\Alg.exe,-112 (ALG) - Unknown owner - C:\Windows\System32\alg.exe (file missing)
O23 - Service: avast! Antivirus - AVAST Software - C:\Program Files\AVAST Software\Avast\AvastSvc.exe
O23 - Service: ConfigFree WiMAX Service (cfWiMAXService) - TOSHIBA CORPORATION - C:\Program Files (x86)\TOSHIBA\ConfigFree\CFIWmxSvcs64.exe
O23 - Service: ConfigFree Gadget Service - TOSHIBA CORPORATION - C:\Program Files (x86)\TOSHIBA\ConfigFree\CFProcSRVC.exe
O23 - Service: ConfigFree Service - TOSHIBA CORPORATION - C:\Program Files (x86)\TOSHIBA\ConfigFree\CFSvcs.exe
O23 - Service: @%SystemRoot%\system32\efssvc.dll,-100 (EFS) - Unknown owner - C:\Windows\System32\lsass.exe (file missing)
O23 - Service: @%systemroot%\system32\fxsresm.dll,-118 (Fax) - Unknown owner - C:\Windows\system32\fxssvc.exe (file missing)
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files (x86)\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: @keyiso.dll,-100 (KeyIso) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @comres.dll,-2797 (MSDTC) - Unknown owner - C:\Windows\System32\msdtc.exe (file missing)
O23 - Service: @%SystemRoot%\System32\netlogon.dll,-102 (Netlogon) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: NVIDIA Display Driver Service (nvsvc) - Unknown owner - C:\Windows\system32\nvvsvc.exe (file missing)
O23 - Service: NVIDIA Update Service Daemon (nvUpdatusService) - NVIDIA Corporation - C:\Program Files (x86)\NVIDIA Corporation\NVIDIA Updatus\daemonu.exe
O23 - Service: O2FLASH - Unknown owner - C:\Windows\system32\DRIVERS\o2flash.exe (file missing)

Merci d'avance