CPU à 100%

Bonjour,
J'ai l'ordinateur portable de mon frère qui a l'UC en permanence à 100% depuis le démarrage. Je ne sais pas depuis quand ça fait ça.

Voici le log HiJackThis. Quelqu'un peut m'aider ?
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 11:41:27, on 15/05/2015
Platform: Unknown Windows (WinNT 6.01.3505 SP1)
MSIE: Internet Explorer v11.0 (11.00.9600.17728)
Boot mode: Normal

Running processes:
C:\Program Files (x86)\ASUS\ATK Package\ATKOSD2\ATKOSD2.exe
C:\Program Files (x86)\ASUS\ASUS Live Update\LiveUpdate.exe
C:\Program Files (x86)\ASUS\FaceLogon\sensorsrv.exe
C:\Program Files (x86)\ASUS\Splendid\ACMON.exe
C:\Windows\AsScrPro.exe
C:\Windows\SysWOW64\ACEngSvr.exe
C:\Program Files (x86)\CyberLink\Power2Go\CLMLSvc.exe
C:\Program Files\AVAST Software\Avast\AvastUI.exe
F:\all\Softs\_SOFTS SECURITE\mbam-setup-1.51.2.1300.exe
C:\Users\stephane\AppData\Local\Temp\is-LDCSC.tmp\mbam-setup-1.51.2.1300.tmp
F:\all\Softs\_SOFTS SECURITE\mbam-setup-1.51.2.1300.exe
C:\Users\stephane\AppData\Local\Temp\is-IM25F.tmp\mbam-setup-1.51.2.1300.tmp
C:\Program Files (x86)\Malwarebytes' Anti-Malware\mbam.exe
F:\all\Softs\_SOFTS SECURITE\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = https://fr.yahoo.com?fr=hp-avast&type=avastbcl
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = https://fr.search.yahoo.com/yhs/search?type=avastbcl&hspart=avast&hsimp=yhs-001&p={searchTerms}
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://fr.yahoo.com?fr=hp-avast&type=avastbcl
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = https://fr.yahoo.com?fr=hp-avast&type=avastbcl
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = https://fr.search.yahoo.com/yhs/search?type=avastbcl&hspart=avast&hsimp=yhs-001&p={searchTerms}
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = https://fr.yahoo.com?fr=hp-avast&type=avastbcl
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 =
F2 - REG:system.ini: UserInit=userinit.exe
O2 - BHO: Trend Micro NSC BHO - {1CA1377B-DC1D-4A52-9585-6E06050FAC53} - C:\Program Files\Trend Micro\AMSP\Module\20004\1.5.1381\6.5.1234\TmIEPlg32.dll
O2 - BHO: avast! Online Security - {8E5E2654-AD2D-48bf-AC2D-D17F00898D06} - C:\Program Files\AVAST Software\Avast\aswWebRepIE.dll
O2 - BHO: Windows Live ID Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: (no name) - {AA58ED58-01DD-4d91-8333-CF10577473F7} - (no file)
O2 - BHO: TmBpIeBHO - {BBACBAFD-FA5E-4079-8B33-00EB9F13D4AC} - C:\Program Files\Trend Micro\AMSP\Module\20002\6.5.1234\6.5.1234\TmBpIe32.dll
O2 - BHO: (no name) - {d2ce3e00-f94a-4740-988e-03dc2f38c34f} - (no file)
O4 - HKLM\..\Run: [AvastUI.exe] "C:\Program Files\AVAST Software\Avast\AvastUI.exe" /nogui
O4 - HKLM\..\RunOnce: [Malwarebytes' Anti-Malware] C:\Program Files (x86)\Malwarebytes' Anti-Malware\mbamgui.exe /install /silent
O4 - HKCU\..\Run: [CCleaner Monitoring] "C:\Program Files\CCleaner\CCleaner64.exe" /MONITOR
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: E&xporter vers Microsoft Excel - res://C:\PROGRA~2\MICROS~1\Office12\EXCEL.EXE/3000
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
O9 - Extra button: HP Smart Print - {22CC3EBD-C286-43aa-B8E6-06B115F74162} - C:\Program Files (x86)\Hewlett-Packard\Smart Print 2.0\smartprintsetup.exe
O9 - Extra 'Tools' menuitem: HP Smart Print - {22CC3EBD-C286-43aa-B8E6-06B115F74162} - C:\Program Files (x86)\Hewlett-Packard\Smart Print 2.0\smartprintsetup.exe
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~2\MICROS~1\Office12\REFIEBAR.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:
O18 - Protocol: tmbp - {1A77E7DC-C9A0-4110-8A37-2F36BAE71ECF} - C:\Program Files\Trend Micro\AMSP\Module\20002\6.5.1234\6.5.1234\TmBpIe32.dll
O18 - Protocol: tmpx - {0E526CB5-7446-41D1-A403-19BFE95E8C23} - C:\Program Files\Trend Micro\AMSP\Module\20004\1.5.1381\6.5.1234\TmIEPlg32.dll
O18 - Protocol: wlpg - {E43EF6CD-A37A-4A9B-9E6F-83F89B8E6324} - C:\Program Files (x86)\Windows Live\Photo Gallery\AlbumDownloadProtocolHandler.dll
O23 - Service: AFBAgent - Unknown owner - C:\Windows\system32\FBAgent.exe (file missing)
O23 - Service: @%SystemRoot%\system32\Alg.exe,-112 (ALG) - Unknown owner - C:\Windows\System32\alg.exe (file missing)
O23 - Service: AMD External Events Utility - Unknown owner - C:\Windows\system32\atiesrxx.exe (file missing)
O23 - Service: AMD FUEL Service - Advanced Micro Devices, Inc. - C:\Program Files\ATI Technologies\ATI.ACE\Fuel\Fuel.Service.exe
O23 - Service: Trend Micro Solution Platform (Amsp) - Trend Micro Inc. - C:\Program Files\Trend Micro\AMSP\coreServiceShell.exe
O23 - Service: ASLDR Service (ASLDRService) - ASUS - C:\Program Files (x86)\ASUS\ATK Package\ATK Hotkey\ASLDRSrv.exe
O23 - Service: ATKGFNEX Service (ATKGFNEXSrv) - ASUS - C:\Program Files (x86)\ASUS\ATK Package\ATKGFNEX\GFNEXSrv.exe
O23 - Service: Avast Antivirus (avast! Antivirus) - Avast Software s.r.o. - C:\Program Files\AVAST Software\Avast\AvastSvc.exe
O23 - Service: AvastVBox COM Service (AvastVBoxSvc) - Avast Software - C:\Program Files\AVAST Software\Avast\ng\vbox\AvastVBoxSVC.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: Service Google Update (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: Google Software Updater (gusvc) - Google - C:\Program Files (x86)\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: @%SystemRoot%\system32\ieetwcollectorres.dll,-1000 (IEEtwCollectorService) - Unknown owner - C:\Windows\system32\IEEtwCollector.exe (file missing)
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: @%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: @%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: TiMiniService - Trend Micro Inc. - C:\Program Files\Trend Micro\Titanium\TiMiniService.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: @%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)