Si ça peut aider, le rapport hijackthis :
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 13:50:26, on 14/03/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16608)
Boot mode: Normal
Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\basfipm.exe
C:\PROGRA~1\SYMANT~1\SYMANT~1\DefWatch.exe
C:\Program Files\Dell\OpenManage\Client\Iap.exe
C:\PROGRA~1\SYMANT~1\SYMANT~1\Rtvscan.exe
C:\Program Files\SolidWorks\COSMOS\FloWorks\bincfw\StandAloneSlv.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\hkcmd.exe
C:\PROGRA~1\SYMANT~1\SYMANT~1\vptray.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Fichiers communs\System\MAPI\1036\nt\MAPISP32.EXE
C:\WINDOWS\msagent\AgentSvr.exe
C:\PROGRA~1\MICROS~2\Office\OUTLOOK.EXE
C:\Program Files\Fichiers communs\eDrawings2008\EModelViewer.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\RunTime\Office\MSACCESS.EXE
C:\Program Files\Fichiers communs\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
C:\Documents and Settings\michaels\Mes documents\HiJackThis.exe
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.euro.dell.com/
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.fr/
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 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O2 - BHO: ST - {9394EDE7-C8B5-483E-8773-474BF36AF6E4} - C:\Program Files\MSN Apps\ST\01.03.0000.1005\en-xu\stmain.dll
O2 - BHO: MSNToolBandBHO - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\MSN Apps\MSN Toolbar\01.02.4000.1001\fr\msntb.dll
O3 - Toolbar: (no name) - {BA52B914-B692-46c4-B683-905236F6F655} - (no file)
O3 - Toolbar: MSN - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\MSN Apps\MSN Toolbar\MSN Toolbar\01.02.5000.1021\fr\msntb.dll
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\system32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\system32\hkcmd.exe
O4 - HKLM\..\Run: [vptray] C:\PROGRA~1\SYMANT~1\SYMANT~1\vptray.exe
O4 - HKLM\..\Run: [FASTTRACKNETVISION] C:\WINDOWS\NETVISION.exe -A *fW1OF58fYjLCyZX1fSw8D5tLEufXwZCwNX1tjR8fE8MC4MX1LTw8TAxLY2fX5MCwLT1xmh8LV8LD4NXEZzwsXBtMx8fSONCwRz1xVB8LR8LDWLXJSXw8VwtMNtfjJfCATC13018L58aj8LHQMXR0jw0LVwcj8MDEaDo5HMvNR5Li0L34cDNyDM1MoxcTvMGlLDV83UyLB5dXhOHwcTJt3khfN2ZHlMmVcjZwGJpeF8YCyMy5dD5lGApe9zbG1OmVdSZ8CwvU5zf30MFwcTNzmA8OF1VDmOHYZTxxmkOfl5fEjNE5Yj58WI8IRyLg2fX=YCx=
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [FASTTRACKNETVISION] C:\WINDOWS\NETVISION.exe -A *fW1OF58fYjLCyZX1fSw8D5tLEufXwZCwNX1tjR8fE8MC4MX1LTw8TAxLY2fX5MCwLT1xmh8LV8LD4NXEZzwsXBtMx8fSONCwRz1xVB8LR8LDWLXJSXw8VwtMNtfjJfCATC13018L58aj8LHQMXR0jw0LVwcj8MDEaDo5HMvNR5Li0L34cDNyDM1MoxcTvMGlLDV83UyLB5dXhOHwcTJt3khfN2ZHlMmVcjZwGJpeF8YCyMy5dD5lGApe9zbG1OmVdSZ8CwvU5zf30MFwcTNzmA8OF1VDmOHYZTxxmkOfl5fEjNE5Yj58WI8IRyLg2fX=YCx=
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: Accélérateur de démarrage AutoCAD.lnk = C:\Program Files\Fichiers communs\Autodesk Shared\acstart16.exe
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O15 - Trusted Zone: http://www.secuser.com
O16 - DPF: {74D05D43-3236-11D4-BDCD-00C04F9A3B61} (HouseCall Control) - http://a840.g.akamai.net/...
O17 - HKLM\System\CCS\Services\Tcpip\Parameters: Domain = BENNESA.fr
O17 - HKLM\Software\..\Telephony: DomainName = BENNESA.fr
O17 - HKLM\System\CS1\Services\Tcpip\Parameters: Domain = BENNESA.fr
O17 - HKLM\System\CS2\Services\Tcpip\Parameters: Domain = BENNESA.fr
O17 - HKLM\System\CS3\Services\Tcpip\Parameters: Domain = BENNESA.fr
O23 - Service: Apple Mobile Device - Apple, Inc. - C:\Program Files\Fichiers communs\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
O23 - Service: Autodesk Licensing Service - Autodesk, Inc. - C:\Program Files\Fichiers communs\Autodesk Shared\Service\AdskScSrv.exe
O23 - Service: Broadcom ASF IP monitoring service v6.0.4 (BAsfIpM) - Broadcom Corp. - C:\WINDOWS\system32\basfipm.exe
O23 - Service: DefWatch - Symantec Corporation - C:\PROGRA~1\SYMANT~1\SYMANT~1\DefWatch.exe
O23 - Service: Iap - Dell Inc - C:\Program Files\Dell\OpenManage\Client\Iap.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Fichiers communs\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Service de l'iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Symantec AntiVirus Client (Norton AntiVirus Server) - Symantec Corporation - C:\PROGRA~1\SYMANT~1\SYMANT~1\Rtvscan.exe
O23 - Service: Remote Solver for COSMOSFloWorks 2006 - Unknown owner - C:\Program Files\SolidWorks\COSMOS\FloWorks\bincfw\StandAloneSlv.exe
O23 - Service: SolidWorks Licensing Service - SolidWorks - C:\Program Files\Fichiers communs\SolidWorks Shared\Service\SolidWorksLicensing.exe
End of file - 7017 bytes