Inquiétudes au sujet de mon ordinateur.

ne concluant pas vite, mais avant tout téléchargez hijack faites un scan et postez nous le résultat, mais de ces symptômes je dirai que votre système a été compromis
si ton problème est résolu marque la question comme résolue tu aideras d'autres personnes tout comme on t'a aidé

Voilà ce que me donne Hijack:
qLogfile of Trend Micro HijackThis v2.0.2
Scan saved at 12:31:03, on 28/01/2012
Platform: Unknown Windows (WinNT 6.01.3505 SP1)
MSIE: Internet Explorer v9.00 (9.00.8112.16421)
Boot mode: Normal

Running processes:
C:\Program Files (x86)\Steam\Steam.exe
C:\Program Files (x86)\Hewlett-Packard\HP Quick Launch\HPMSGSVC.exe
C:\Program Files (x86)\Avira\AntiVir Desktop\avgnt.exe
C:\Program Files (x86)\CheckPoint\ZoneAlarm\zatray.exe
C:\Program Files (x86)\Malwarebytes' Anti-Malware\mbamgui.exe
C:\Program Files (x86)\CheckPoint\ZoneAlarm\vsmon.exe
C:\Program Files (x86)\CyberLink\YouCam\YCMMirage.exe
C:\Users\Rezd\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Rezd\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Windows\SysWOW64\rundll32.exe
C:\Users\Rezd\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Rezd\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Rezd\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Rezd\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Anti Keylogger Shield\AntiKeyloggerShield.exe
C:\Users\Rezd\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Rezd\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Rezd\Downloads\HiJackThis (1).exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://g.uk.msn.com/HPNOT/3
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 = https://www.msn.com/fr-fr?cobrand=hp-notebook.msn.com&ocid=HPDHP&pc=HPNTDF
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://g.uk.msn.com/HPNOT/3
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 = https://home.sweetim.com/
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 = 78.108.83.148:8000
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
R3 - URLSearchHook: Protection ZoneAlarm Toolbar - {d7f26d0e-9801-45c3-a091-8a65e4ed73b5} - C:\Program Files (x86)\Protection_ZoneAlarm\prxtbProt.dll
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: ZoneAlarm Security Engine Registrar - {8A4A36C2-0535-4D2C-BD3D-496CB7EED6E3} - C:\Program Files\CheckPoint\ZAForceField\WOW64\TrustChecker\bin\TrustCheckerIEPlugin.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: Protection ZoneAlarm - {d7f26d0e-9801-45c3-a091-8a65e4ed73b5} - C:\Program Files (x86)\Protection_ZoneAlarm\prxtbProt.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: ZoneAlarm Security Engine - {EE2AC4E5-B0B0-4EC6-88A9-BCA1A32AB107} - C:\Program Files\CheckPoint\ZAForceField\WOW64\TrustChecker\bin\TrustCheckerIEPlugin.dll
O4 - HKLM\..\Run: [HP Quick Launch] C:\Program Files (x86)\Hewlett-Packard\HP Quick Launch\HPMSGSVC.exe
O4 - HKLM\..\Run: [avgnt] "C:\Program Files (x86)\Avira\AntiVir Desktop\avgnt.exe" /min
O4 - HKLM\..\Run: [ZoneAlarm] C:\Program Files (x86)\CheckPoint\ZoneAlarm\zatray.exe
O4 - HKLM\..\Run: [Malwarebytes' Anti-Malware] "C:\Program Files (x86)\Malwarebytes' Anti-Malware\mbamgui.exe" /starttray
O4 - HKLM\..\Run: [Adobe ARM] "C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\AdobeARM.exe"
O4 - HKCU\..\Run: [Steam] "C:\Program Files (x86)\Steam\steam.exe" -silent
O4 - HKCU\..\Run: [DAEMON Tools Lite] "C:\Program Files (x86)\DAEMON Tools Lite\DTLite.exe" -autorun
O4 - HKUS\S-1-5-18\..\Run: [LightScribe Control Panel] C:\Program Files (x86)\Common Files\LightScribe\LightScribeControlPanel.exe -hidden (User 'Système')
O4 - HKUS\.DEFAULT\..\Run: [LightScribe Control Panel] C:\Program Files (x86)\Common Files\LightScribe\LightScribeControlPanel.exe -hidden (User 'Default user')
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
O16 - DPF: {CAFEEFAC-0016-0000-0021-ABCDEFFEDCBA} (Java Plug-in 1.6.0_21) -
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/pub/shockwave/cabs/flash/swflash.cab
O23 - Service: Adobe Acrobat Update Service (AdobeARMservice) - Unknown owner - C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\armsvc.exe (file missing)
O23 - Service: Andrea RT Filters Service (AERTFilters) - Andrea Electronics Corporation - C:\Program Files\Realtek\Audio\HDA\AERTSr64.exe
O23 - Service: Avira AntiVir Planificateur (AntiVirSchedulerService) - Avira GmbH - C:\Program Files (x86)\Avira\AntiVir Desktop\sched.exe
O23 - Service: Avira AntiVir Guard (AntiVirService) - Avira GmbH - C:\Program Files (x86)\Avira\AntiVir Desktop\avguard.exe
O23 - Service: @%SystemRoot%\system32\efssvc.dll,-100 (EFS) - Unknown owner - C:\Windows\System32\lsass.exe (file missing)
O23 - Service: HP Wireless Assistant Service - Hewlett-Packard Company - C:\Program Files\Hewlett-Packard\HP Wireless Assistant\HPWA_Service.exe
O23 - Service: HP Client Services (HPClientSvc) - Hewlett-Packard Company - C:\Program Files\Hewlett-Packard\HP Client Services\HPClientServices.exe
O23 - Service: HP Quick Synchronization Service (HPDrvMntSvc.exe) - Hewlett-Packard Company - C:\Program Files (x86)\Hewlett-Packard\Shared\HPDrvMntSvc.exe
O23 - Service: HP Software Framework Service (hpqwmiex) - Hewlett-Packard Company - C:\Program Files (x86)\Hewlett-Packard\Shared\hpqWmiEx.exe
O23 - Service: HPWMISVC - Hewlett-Packard Development Company, L.P. - C:\Program Files (x86)\Hewlett-Packard\HP Quick Launch\HPWMISVC.exe
O23 - Service: ZoneAlarm Toolbar IswSvc (IswSvc) - Check Point Software Technologies - C:\Program Files\CheckPoint\ZAForceField\IswSvc.exe
O23 - Service: @keyiso.dll,-100 (KeyIso) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: LibUsb-Win32 - Daemon, Version 0.1.10.1 (libusbd) - https://sourceforge.net/p/libusb-win32/wiki/Home/ - C:\Windows\system32\libusbd-nt.exe
O23 - Service: Intel(R) Management and Security Application Local Management Service (LMS) - Intel Corporation - C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\LMS\LMS.exe
O23 - Service: MBAMService - Malwarebytes Corporation - C:\Program Files (x86)\Malwarebytes' Anti-Malware\mbamservice.exe
O23 - Service: @comres.dll,-2797 (MSDTC) - Unknown owner - C:\Windows\System32\msdtc.exe (file missing)
O23 - Service: nProtect GameGuard Service (npggsvc) - Unknown owner - C:\Windows\system32\GameMon.des.exe (file missing)
O23 - Service: @%systemroot%\system32\psbase.dll,-300 (ProtectedStorage) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: RtVOsdService Installer (RtVOsdService) - Realtek Semiconductor Corp. - C:\Program Files\Realtek\RtVOsd\RtVOsdService.exe
O23 - Service: @%SystemRoot%\system32\samsrv.dll,-1 (SamSs) - Unknown owner - C:\Windows\system32\lsass.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: Steam Client Service - Valve Corporation - C:\Program Files (x86)\Common Files\Steam\SteamService.exe
O23 - Service: Intel(R) Management & Security Application User Notification Service (UNS) - Intel Corporation - C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\UNS\UNS.exe
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)

je viens de faire un petit scan méticuleux sur les processus que je connais pas, voila le résultat :

%ProgramFiles%\anti keylogger shield\antikeyloggershield.exe
The file "antikeyloggershield.exe" was identified as a threat.
Trojan-Banker.Win32.Banker.asge [Kaspersky Lab]

les autres antivirus l'ont pas détecté, vous devriez désinstaller ce programme ou le supprimer

Je vais le supprimer sur le champ, merci.