On m'a conseillé de faire un scan avec Hitjaker.... la voici...en espérant que vous pourrez m'aider le plus tôt possible...

Running processes:
C:\WINDOWS\SYSTEM\KERNEL32.DLL
C:\WINDOWS\SYSTEM\MSGSRV32.EXE
C:\WINDOWS\SYSTEM\mmtask.tsk
C:\WINDOWS\SYSTEM\MPREXE.EXE
C:\WINDOWS\SYSTEM\MSTASK.EXE
C:\WINDOWS\SYSTEM\MDM.EXE
C:\PROGRAM FILES\GRISOFT\AVG6\AVGSERV9.EXE
C:\WINDOWS\SYSTEM\RESTORE\STMGR.EXE
C:\WINDOWS\SYSTEM\DDHELP.EXE
C:\WINDOWS\TASKMON.EXE
C:\WINDOWS\SYSTEM\SYSTRAY.EXE
C:\WINDOWS\SYSTEM\INTERNAT.EXE
C:\PROGRAM FILES\ASSISTANTINTERNET\SMARTBRIDGE\MOTIVESB.EXE
C:\WINDOWS\LOADQM.EXE
C:\PROGRAM FILES\GRISOFT\AVG6\AVGCC32.EXE
C:\PROGRAM FILES\ASSISTANTINTERNET\BIN\MPBTN.EXE
C:\WINDOWS\EXPLORER.EXE
C:\PROGRAM FILES\INTERNET EXPLORER\IEXPLORE.EXE
C:\MES DOCUMENTS\FICHIERS REçUS\HIJACKTHIS.EXE
C:\PROGRAM FILES\SYMPATICO\GESTIONNAIRE D'ACCèS\APP\ENTERNET.EXE
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = file://C:\WINDOWS\TEMP\sp.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = file://C:\WINDOWS\TEMP\sp.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = C:\WINDOWS\secure.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,SearchAssistant = file://C:\WINDOWS\TEMP\sp.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = file://C:\WINDOWS\TEMP\sp.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = file://C:\WINDOWS\TEMP\sp.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.msn.fr
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = file://C:\WINDOWS\TEMP\sp.html
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = ;127.0.0.1;<local>
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page = C:\WINDOWS\secure.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,HomeOldSP = about:blank
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: (no name) - {32D566C8-862F-460E-B8CA-B6B0C43E135A} - C:\WINDOWS\SYSTEM\DINPIBA.DLL
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\SYSTEM\MSDXM.OCX
O4 - HKLM\..\Run: [ScanRegistry] C:\WINDOWS\scanregw.exe /autorun
O4 - HKLM\..\Run: [TaskMonitor] C:\WINDOWS\taskmon.exe
O4 - HKLM\..\Run: [PCHealth] C:\WINDOWS\PCHealth\Support\PCHSchd.exe -s
O4 - HKLM\..\Run: [SystemTray] SysTray.Exe
O4 - HKLM\..\Run: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\Run: [internat.exe] internat.exe
O4 - HKLM\..\Run: [Motive SmartBridge] C:\PROGRA~1\ASSIST~1\SMARTB~1\MotiveSB.exe
O4 - HKLM\..\Run: [LoadQM] loadqm.exe
O4 - HKLM\..\Run: [AVG_CC] C:\PROGRA~1\GRISOFT\AVG6\avgcc32.exe /STARTUP
O4 - HKLM\..\RunServices: [LoadPowerProfile] Rundll32.exe powrprof.dll,LoadCurrentPwrScheme
O4 - HKLM\..\RunServices: [SchedulingAgent] mstask.exe
O4 - HKLM\..\RunServices: [*StateMgr] C:\WINDOWS\System\Restore\StateMgr.exe
O4 - HKLM\..\RunServices: [Machine Debug Manager] C:\WINDOWS\SYSTEM\MDM.EXE
O4 - HKLM\..\RunServices: [Avgserv9.exe] C:\PROGRA~1\GRISOFT\AVG6\Avgserv9.exe
O4 - Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office\OSA9.EXE
O4 - Startup: EPSON Background Monitor.lnk = C:\ESM2\Stms.exe
O4 - Startup: Assistant Internet.lnk = C:\Program Files\AssistantInternet\bin\matcli.exe
O9 - Extra button: Related (HKLM)
O9 - Extra 'Tools' menuitem: Show &Related Links (HKLM)
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://download.macromedia.com/pub/shoc ... wflash.cab
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