Problème avec mon PC

Bonjour, aujourd'hui en allumant mon PC:
_ ma barre de tâches est devenue grise (comme sur un windows ancien)
_ le centre de sécurité windows a été désactivé et impossible de le réactiver
_ je n'ai plus aucun accès à internet et impossible d'accéder au centre réseau
_ divers problèmes bizarre qui me font penser à un virus.

J'ai donc lancer mon ordinateur en mode sans échec:
_ fais un scan Avira sans résultat
_ un scan spybot qui a détecter quelques trucs que j'ai réparer.
_ réparer le registre avec ccleaner.

Pour autant aucune évolution.
Voilà le rapport Hi jack this en mode sans échec:
Logfile of Trend Micro HijackThis v2.0.5
Scan saved at 16:17:35, on 31/08/2014
Platform: Windows 7 SP1 (WinNT 6.00.3505)
MSIE: Internet Explorer v11.0 (11.00.9600.17239)
CHROME: 36.0.1985.143

Boot mode: Safe mode with network support

Running processes:
C:\windows\Explorer.EXE
C:\windows\system32\ctfmon.exe
C:\windows\system32\igfxsrvc.exe
C:\Users\Thibaut\Desktop\Antivirus\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = Preserve
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 =
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 = about:blank
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O2 - BHO: HP Print Enhancer - {0347C33E-8762-4905-BF09-768834316C61} - C:\Program Files\HP\Digital Imaging\Smart Web Printing\hpswp_printenhancer.dll
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\Program Files\Spybot - Search & Destroy 2\SDHelper.dll
O2 - BHO: Windows Live ID Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Windows Live Messenger Companion Helper - {9FDDE16B-836F-4806-AB1F-1455CBEFF289} - C:\Program Files\Windows Live\Companion\companioncore.dll
O2 - BHO: W2PBrowser Browser Helper - {AA609D72-8482-4076-8991-8CDAE5B93BCB} - C:\Program Files\Samsung AnyWeb Print\W2PBrowser.dll
O2 - BHO: HP Smart BHO Class - {FFFFFFFF-CF4E-4F2B-BDC2-0E72E116A856} - C:\Program Files\HP\Digital Imaging\Smart Web Printing\hpswp_BHO.dll
O3 - Toolbar: (no name) - {CC1A175A-E45B-41ED-A30C-C9B1D7A0C02F} - (no file)
O4 - HKLM\..\Run: [avgnt] "C:\Program Files\Avira\AntiVir Desktop\avgnt.exe" /min
O4 - HKLM\..\Run: [Avira Systray] C:\Program Files\Avira\My Avira\Avira.OE.Systray.exe
O4 - HKLM\..\Run: [SynTPEnh] %ProgramFiles%\Synaptics\SynTP\SynTPEnh.exe
O4 - HKLM\..\Run: [SDTray] "C:\Program Files\Spybot - Search & Destroy 2\SDTray.exe"
O4 - HKCU\..\Run: [StarterBackgroundChanger] "C:\Program Files\StarterBackgroundChanger\StarterBackgroundChangerTask.exe"
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User '?')
O4 - HKUS\S-1-5-20\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User '?')
O4 - HKUS\S-1-5-21-3912383593-2352673496-10441196-1000\..\Run: [FAST Defrag] (User '?')
O4 - HKUS\S-1-5-18\..\Run: [Bitdefender Agent de l'application Wallet] "C:\Program Files\Bitdefender\Bitdefender\bdapppassmgr.exe" (User '?')
O4 - HKUS\.DEFAULT\..\Run: [Bitdefender Agent de l'application Wallet] "C:\Program Files\Bitdefender\Bitdefender\bdapppassmgr.exe" (User 'Default user')
O9 - Extra button: @C:\Program Files\Windows Live\Companion\companionlang.dll,-600 - {0000036B-C524-4050-81A0-243669A86B9F} - C:\Program Files\Windows Live\Companion\companioncore.dll
O9 - Extra button: @C:\Program Files\Windows Live\Writer\WindowsLiveWriterShortcuts.dll,-1004 - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Program Files\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra 'Tools' menuitem: @C:\Program Files\Windows Live\Writer\WindowsLiveWriterShortcuts.dll,-1003 - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Program Files\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra button: HP Smart Print - {22CC3EBD-C286-43aa-B8E6-06B115F74162} - C:\Program Files\Hewlett-Packard\SmartPrint\smartprintsetup.exe
O9 - Extra 'Tools' menuitem: HP Smart Print - {22CC3EBD-C286-43aa-B8E6-06B115F74162} - C:\Program Files\Hewlett-Packard\SmartPrint\smartprintsetup.exe
O9 - Extra button: Samsung AnyWeb Print - {328ECD19-C167-40eb-A0C7-16FE7634105E} - C:\Program Files\Samsung AnyWeb Print\W2PBrowser.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\REFIEBAR.DLL
O9 - Extra button: @C:\Program Files\WIDCOMM\Bluetooth Software\btrez.dll,-4015 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Program Files\WIDCOMM\Bluetooth Software\btsendto_ie.htm
O9 - Extra 'Tools' menuitem: @C:\Program Files\WIDCOMM\Bluetooth Software\btrez.dll,-12650 - {CCA281CA-C863-46ef-9331-5C8D4460577F} - C:\Program Files\WIDCOMM\Bluetooth Software\btsendto_ie.htm
O9 - Extra button: Afficher ou masquer l'HP Smart Web Printing - {DDE87865-83C5-48c4-8357-2F5B1AA84522} - C:\Program Files\HP\Digital Imaging\Smart Web Printing\hpswp_BHO.dll
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\Program Files\Spybot - Search & Destroy 2\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search && Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\Program Files\Spybot - Search & Destroy 2\SDHelper.dll
O10 - Unknown file in Winsock LSP: c:\program files\common files\microsoft shared\windows live\wlidnsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\common files\microsoft shared\windows live\wlidnsp.dll
O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\COMMON~1\Skype\SKYPE4~1.DLL
O18 - Protocol: wlpg - {E43EF6CD-A37A-4A9B-9E6F-83F89B8E6324} - C:\Program Files\Windows Live\Photo Gallery\AlbumDownloadProtocolHandler.dll
O20 - Winlogon Notify: SDWinLogon - SDWinLogon.dll (file missing)
O23 - Service: Avira Planificateur (AntiVirSchedulerService) - Avira Operations GmbH & Co. KG - C:\Program Files\Avira\AntiVir Desktop\sched.exe
O23 - Service: Avira Protection temps réel (AntiVirService) - Avira Operations GmbH & Co. KG - C:\Program Files\Avira\AntiVir Desktop\avguard.exe
O23 - Service: Avira Protection Web (AntiVirWebService) - Avira Operations GmbH & Co. KG - C:\Program Files\Avira\AntiVir Desktop\avwebg7.exe
O23 - Service: @%systemroot%\system32\appinfo.dll,-100 (Appinfo) - Unknown owner - C:\windows\system32\svchost.exe
O23 - Service: Avira Service Host (Avira.OE.ServiceHost) - Avira Operations GmbH & Co. KG - C:\Program Files\Avira\My Avira\Avira.OE.ServiceHost.exe
O23 - Service: @%SystemRoot%\system32\qmgr.dll,-1000 (BITS) - Unknown owner - C:\windows\System32\svchost.exe
O23 - Service: @%SystemRoot%\system32\cryptsvc.dll,-1001 (CryptSvc) - Unknown owner - C:\windows\system32\svchost.exe
O23 - Service: @oleres.dll,-5012 (DcomLaunch) - Unknown owner - C:\windows\system32\svchost.exe
O23 - Service: @%systemroot%\system32\dot3svc.dll,-1102 (dot3svc) - Unknown owner - C:\windows\system32\svchost.exe
O23 - Service: @gpapi.dll,-112 (gpsvc) - Unknown owner - C:\windows\system32\svchost.exe
O23 - Service: @%SystemRoot%\system32\FirewallAPI.dll,-23090 (MpsSvc) - Unknown owner - C:\windows\system32\svchost.exe
O23 - Service: @%SystemRoot%\system32\netman.dll,-109 (Netman) - Unknown owner - C:\windows\System32\svchost.exe
O23 - Service: @%SystemRoot%\system32\umpnpmgr.dll,-100 (PlugPlay) - Unknown owner - C:\windows\system32\svchost.exe
O23 - Service: @%systemroot%\system32\profsvc.dll,-300 (ProfSvc) - Unknown owner - C:\windows\system32\svchost.exe
O23 - Service: @%windir%\system32\RpcEpMap.dll,-1001 (RpcEptMapper) - Unknown owner - C:\windows\system32\svchost.exe
O23 - Service: @oleres.dll,-5010 (RpcSs) - Unknown owner - C:\windows\system32\svchost.exe
O23 - Service: @%SystemRoot%\system32\schedsvc.dll,-100 (Schedule) - Unknown owner - C:\windows\system32\svchost.exe
O23 - Service: Spybot-S&D 2 Scanner Service (SDScannerService) - Safer-Networking Ltd. - C:\Program Files\Spybot - Search & Destroy 2\SDFSSvc.exe
O23 - Service: Spybot-S&D 2 Updating Service (SDUpdateService) - Safer-Networking Ltd. - C:\Program Files\Spybot - Search & Destroy 2\SDUpdSvc.exe
O23 - Service: Spybot-S&D 2 Security Center Service (SDWSCService) - Safer-Networking Ltd. - C:\Program Files\Spybot - Search & Destroy 2\SDWSCSvc.exe
O23 - Service: @%SystemRoot%\system32\sppsvc.exe,-101 (sppsvc) - Unknown owner - C:\windows\system32\sppsvc.exe
O23 - Service: Centre de sécurité (wscsvc) - Unknown owner - C:\windows\System32\svchost.exe