Problème avec svchost.exe

Bonjour,
Depuis quelques temps, j'ai des freeze, des ralentissements d'internet, et sur certains jeux, mon PC s'éteint tout seul après quelques minutes (je pensais que c'était dû à une surchauffe, mais entre la ventilation, la chaussette pleine de glaçons, ça ne doit pas être ça...). Une fois l'hypothèse de la surchauffe écartée, j'ai jeté un oeil à mon gestionnaire des tâches, qui m'indique qu'un des processus svchost.exe prend beaucoup plus de RAM que ce qu'il ne devrait. Je suis donc parti voir les services auxquels il était rattaché, mais je n'ai rien trouvé qui me semble a priori illégitime. Quelques analyses antivirus et anti-spywares plus tard, toujours rien.
J'ai lancé hijackthis, je posterai le rapport à la fin du post. J'ai uploadé mon rapport sur http://www.hijackthis.de/fr, et un seul service a eu l'air suspect, et comme par hasard il était rattaché au svchost.exe qui me cause du souci... J'ai donc demandé à hijackthis de le désactiver, mais rien à faire, ça ne part pas. Si quelqu'un a une idée, je suis preneur!



Rapport hijackthis, avec en gras le service concerné:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 15:15:12, on 07/07/2011
Platform: Unknown Windows (WinNT 6.01.3505 SP1)
MSIE: Internet Explorer v9.00 (9.00.8112.16421)
Boot mode: Normal

Running processes:
F:\Program Files\hamachi-2-ui.exe
C:\Program Files (x86)\Intel\Intel Matrix Storage Manager\IAAnotif.exe
C:\Program Files (x86)\ASUS\ATKOSD2\ATKOSD2.exe
C:\Program Files (x86)\ASUS\ATK Hotkey\HControlUser.exe
C:\Program Files (x86)\ASUS\ATK Media\DMedia.exe
C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe
C:\Program Files (x86)\DivX\DivX Update\DivXUpdate.exe
C:\Program Files (x86)\AVG\AVG10\avgtray.exe
C:\Program Files (x86)\iTunes\iTunesHelper.exe
C:\Program Files (x86)\AVG\AVG10\Identity Protection\agent\bin\avgidsmonitor.exe
C:\Program Files (x86)\Skype\Phone\Skype.exe
C:\Program Files (x86)\Mozilla Firefox\firefox.exe
C:\Program Files (x86)\Mozilla Firefox\plugin-container.exe
C:\Users\Ismael\Desktop\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
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://go.microsoft.com/fwlink/?LinkId=69157
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://go.microsoft.com/fwlink/?LinkId=69157
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
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyServer = 127.0.0.1:8080
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = local;*.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = 
R3 - URLSearchHook: PC Tools Browser Guard - {472734EA-242A-422b-ADF8-83D1E48CC825} - C:\Program Files (x86)\Spyware Doctor\BDT\PCTBrowserDefender.dll
F2 - REG:system.ini: Shell=explorer.exe "C:\Users\Ismael\AppData\Roaming\ozxooqknrmzguyxifpvrxbyxpwyueej2\csrss.exe"
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: Browser Defender BHO - {2A0F3D1B-0909-4FF4-B272-609CCE6054E7} - C:\Program Files (x86)\Spyware Doctor\BDT\PCTBrowserDefender.dll
O2 - BHO: Increase performance and video formats for your HTML5 <video> - {326E768D-4182-46FD-9C16-1449A49795F4} - C:\Program Files (x86)\DivX\DivX Plus Web Player\ie\DivXHTML5\DivXHTML5.dll
O2 - BHO: WormRadar.com IESiteBlocker.NavFilter - {3CA2F312-6F6E-4B53-A66E-4E65E497C8C0} - C:\Program Files (x86)\AVG\AVG10\avgssie.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: SkypeIEPluginBHO - {AE805869-2E5C-4ED4-8F7B-F1F7851A4497} - C:\Program Files (x86)\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O2 - BHO: FlashGetBHO - {b070d3e3-fec0-47d9-8e8a-99d4eeb3d3b0} - C:\Users\Ismael\AppData\Roaming\FlashGetBHO\FlashGetBHO3.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: PC Tools Browser Guard - {472734EA-242A-422B-ADF8-83D1E48CC825} - C:\Program Files (x86)\Spyware Doctor\BDT\PCTBrowserDefender.dll
O4 - HKLM\..\Run: [ATKOSD2] C:\Program Files (x86)\ASUS\ATKOSD2\ATKOSD2.exe
O4 - HKLM\..\Run: [HControlUser] C:\Program Files (x86)\ASUS\ATK Hotkey\HControlUser.exe
O4 - HKLM\..\Run: [ATKMEDIA] C:\Program Files (x86)\ASUS\ATK Media\DMedia.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: [QuickTime Task] "C:\Program Files (x86)\QuickTime\QTTask.exe" -atboottime
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [DivXUpdate] "C:\Program Files (x86)\DivX\DivX Update\DivXUpdate.exe" /CHECKNOW
O4 - HKLM\..\Run: [AVG_TRAY] C:\Program Files (x86)\AVG\AVG10\avgtray.exe
O4 - HKLM\..\Run: [LogMeIn Hamachi Ui] "F:\Program Files\hamachi-2-ui.exe" --auto-start
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files (x86)\iTunes\iTunesHelper.exe"
O4 - HKCU\..\Run: [FlashGet 3] "C:\Program Files (x86)\FlashGet Network\FlashGet 3\FlashGet3.exe" -minimize
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')
O8 - Extra context menu item: Download all by FlashGet3 - C:\Users\Ismael\AppData\Roaming\FlashGetBHO\GetAllUrl.htm
O8 - Extra context menu item: Download by FlashGet3 - C:\Users\Ismael\AppData\Roaming\FlashGetBHO\GetUrl.htm
O9 - Extra button: Skype Plug-In - {898EA8C8-E7FF-479B-8935-AEC46303B9E5} - C:\Program Files (x86)\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O9 - Extra 'Tools' menuitem: Skype Plug-In - {898EA8C8-E7FF-479B-8935-AEC46303B9E5} - C:\Program Files (x86)\Skype\Toolbars\Internet Explorer\skypeieplugin.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
O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics
O13 - Gopher Prefix: 
O16 - DPF: {2357B3CF-7F8D-4451-8D81-FD6097610AEE} - http://activex.camfrogweb.com/advanced/2.0.2.3/cfweb_activex.camfrogweb.com-advanced-2.0.2.3_instmodule.exe
O16 - DPF: {5D6F45B3-9043-443D-A792-115447494D24} (UnoCtrl Class) - http://messenger.zone.msn.com/MessengerGamesContent/GameContent/fr/uno1/GAME_UNO1.cab
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
O18 - Protocol: linkscanner - {F274614C-63F8-47D5-A4D1-FBDDE494F8D1} - C:\Program Files (x86)\AVG\AVG10\avgpp.dll
O18 - Protocol: skype-ie-addon-data - {91774881-D725-4E58-B298-07617B9B86A8} - C:\Program Files (x86)\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O23 - Service: @%SystemRoot%\system32\Alg.exe,-112 (ALG) - Unknown owner - C:\Windows\System32\alg.exe (file missing)
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files (x86)\Common Files\Apple\Mobile Device Support\AppleMobileDeviceService.exe
O23 - Service: ASLDR Service (ASLDRService) - ASUS - C:\Program Files (x86)\ASUS\ATK Hotkey\ASLDRSrv.exe
O23 - Service: ATKGFNEX Service (ATKGFNEXSrv) - Unknown owner - C:\Program Files\ATKGFNEX\GFNEXSrv.exe
O23 - Service: Pare-feu AVG (avgfws) - AVG Technologies CZ, s.r.o. - C:\Program Files (x86)\AVG\AVG10\avgfws.exe
O23 - Service: AVGIDSAgent - AVG Technologies CZ, s.r.o. - C:\Program Files (x86)\AVG\AVG10\Identity Protection\Agent\Bin\AVGIDSAgent.exe
O23 - Service: AVG WatchDog (avgwd) - AVG Technologies CZ, s.r.o. - C:\Program Files (x86)\AVG\AVG10\avgwdsvc.exe
O23 - Service: Service Bonjour (Bonjour Service) - Apple Inc. - C:\Program Files (x86)\Bonjour\mDNSResponder.exe
O23 - Service: Browser Defender Update Service - Threat Expert Ltd. - C:\Program Files (x86)\Spyware Doctor\BDT\BDTUpdateService.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: Google Update Service (gupdate) (gupdate) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: Service Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: LogMeIn Hamachi 2.0 Tunneling Engine (Hamachi2Svc) - LogMeIn Inc. - F:\Program Files\hamachi-2.exe
O23 - Service: Intel(R) Matrix Storage Event Monitor (IAANTMON) - Intel Corporation - C:\Program Files (x86)\Intel\Intel Matrix Storage Manager\IAANTMon.exe
O23 - Service: Service de l'iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.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: @%systemroot%\system32\psbase.dll,-300 (ProtectedStorage) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%systemroot%\system32\Locator.exe,-2 (RpcLocator) - Unknown owner - C:\Windows\system32\locator.exe (file missing)
O23 - Service: @%SystemRoot%\system32\samsrv.dll,-1 (SamSs) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: PC Tools Auxiliary Service (sdAuxService) - PC Tools - C:\Program Files (x86)\Spyware Doctor\pctsAuxs.exe
O23 - Service: PC Tools Security Service (sdCoreService) - PC Tools - C:\Program Files (x86)\Spyware Doctor\pctsSvc.exe
O23 - Service: @%SystemRoot%\system32\snmptrap.exe,-3 (SNMPTRAP) - Unknown owner - C:\Windows\System32\snmptrap.exe (file missing)
O23 - Service: @%systemroot%\system32\spoolsv.exe,-1 (Spooler) - Unknown owner - C:\Windows\System32\spoolsv.exe (file missing)
O23 - Service: @%SystemRoot%\system32\sppsvc.exe,-101 (sppsvc) - Unknown owner - C:\Windows\system32\sppsvc.exe (file missing)
O23 - Service: StarWind AE Service (StarWindServiceAE) - StarWind Software - C:\Program Files (x86)\Alcohol Soft\Alcohol 120\StarWind\StarWindServiceAE.exe
O23 - Service: Steam Client Service - Valve Corporation - C:\Program Files (x86)\Common Files\Steam\SteamService.exe
O23 - Service: @%SystemRoot%\system32\ui0detect.exe,-101 (UI0Detect) - Unknown owner - C:\Windows\system32\UI0Detect.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vaultsvc.dll,-1003 (VaultSvc) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vds.exe,-100 (vds) - Unknown owner - C:\Windows\System32\vds.exe (file missing)
O23 - Service: @%systemroot%\system32\vssvc.exe,-102 (VSS) - Unknown owner - C:\Windows\system32\vssvc.exe (file missing)
O23 - Service: @%SystemRoot%\system32\Wat\WatUX.exe,-601 (WatAdminSvc) - Unknown owner - C:\Windows\system32\Wat\WatAdminSvc.exe (file missing)
O23 - Service: @%systemroot%\system32\wbengine.exe,-104 (wbengine) - Unknown owner - C:\Windows\system32\wbengine.exe (file missing)
O23 - Service: Windows Device Instrumentation (WDI) - Unknown owner - C:\WINDOWS\system32\drivers\sysmgr\svchost.exe (file missing)
O23 - Service: @%Systemroot%\system32\wbem\wmiapsrv.exe,-110 (wmiApSrv) - Unknown owner - C:\Windows\system32\wbem\WmiApSrv.exe (file missing)
O23 - Service: @%PROGRAMFILES%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown owner - C:\Program Files (x86)\Windows Media Player\wmpnetwk.exe (file missing)

Merci beaucoup!