pb de déconnexion

Bonjour,

depuis quelques jours mon ordi se déconnecte d'internet tout seul. J'ai fait une analyse secuser , je n'ai pas de virus.
J'ai fait une analyse hitjackthis.
Voilà le résultat :
Logfile of HijackThis v1.99.1
Scan saved at 11:22:55, on 19/02/2006
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\csrss.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\svchost.exe
C:\Program Files\Sygate\SPF\smc.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Network Associates\Common Framework\FrameworkService.exe
C:\Program Files\Network Associates\VirusScan\Mcshield.exe
C:\Program Files\Network Associates\VirusScan\VsTskMgr.exe
C:\PROGRA~1\NETWOR~1\COMMON~1\naPrdMgr.exe
C:\Program Files\Fichiers communs\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\Program Files\Canon\MultiPASS4\MPSERVIC.EXE
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\wdfmgr.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\System32\alg.exe
C:\WINDOWS\system32\wbem\wmiprvse.exe
C:\WINDOWS\SOUNDMAN.EXE
C:\WINDOWS\system32\VTTimer.exe
C:\Program Files\ScanSoft\OmniPageSE\opware32.exe
C:\Program Files\MessengerPlus! 3\MsgPlus.exe
C:\Program Files\Network Associates\VirusScan\SHSTAT.EXE
C:\Program Files\Network Associates\Common Framework\UpdaterUI.exe
C:\Program Files\Roxio\Easy Media Creator 7\Drag to Disc\DrgToDsc.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Skype\Phone\Skype.exe
C:\Program Files\a-squared\a2guard.exe
C:\Program Files\MSN Messenger\msnmsgr.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\Antipub\antipub.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Program Files\Microsoft Office\OFFICE11\OUTLOOK.EXE
C:\Program Files\Microsoft Office\OFFICE11\WINWORD.EXE
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Documents and Settings\PEGGY ELEONORE\Local Settings\Temporary Internet Files\Content.IE5\EXG50P8F\HijackThis[1].exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://web.gcdnlzazufxxto.net/YK5F [...] nfQPh.html
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.fr/
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://192.168.1.1/ServicesAcces.html
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
F2 - REG:system.ini: UserInit=C:\WINDOWS\system32\Userinit.exe
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {164B6512-E981-B9E9-543B-A71ACC025ED1} - (no file)
O2 - BHO: (no name) - {FDD3B846-8D59-4ffb-8758-209B6AD74ACC} - C:\Program Files\Microsoft Money\System\mnyviewer.dll
O3 - Toolbar: Easy-WebPrint - {327C2873-E90D-4c37-AA9D-10AC9BABA46C} - C:\Program Files\Canon\Easy-WebPrint\Toolband.dll
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [VTTimer] VTTimer.exe
O4 - HKLM\..\Run: [Omnipage] C:\Program Files\ScanSoft\OmniPageSE\opware32.exe
O4 - HKLM\..\Run: [MessengerPlus3] "C:\Program Files\MessengerPlus! 3\MsgPlus.exe"
O4 - HKLM\..\Run: [MoneyStartUp10.0] "C:\Program Files\Microsoft Money\System\Activation.exe"
O4 - HKLM\..\Run: [SmcService] C:\PROGRA~1\Sygate\SPF\smc.exe -startgui
O4 - HKLM\..\Run: [ShStatEXE] "C:\Program Files\Network Associates\VirusScan\SHSTAT.EXE" /STANDALONE
O4 - HKLM\..\Run: [McAfeeUpdaterUI] "C:\Program Files\Network Associates\Common Framework\UpdaterUI.exe" /StartedFromRunKey
O4 - HKLM\..\Run: [RoxioDragToDisc] "C:\Program Files\Roxio\Easy Media Creator 7\Drag to Disc\DrgToDsc.exe"
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MessengerPlus3] "C:\Program Files\MessengerPlus! 3\MsgPlus.exe" /WinStart
O4 - HKCU\..\Run: [SOProc_SoRefRegSoAlertWxLiteNnAj] rundll32 shell32.dll,ShellExec_RunDLL C:\PROGRA~1\SOFTWA~1\soproc.exe -pack SoRefRegSoAlertWxLiteNnAj
O4 - HKCU\..\Run: [Download curb] C:\DOCUME~1\PEGGYE~1\APPLIC~1\PHONEF~1\BirdDumbTray.exe
O4 - HKCU\..\Run: [Skype] "C:\Program Files\Skype\Phone\Skype.exe" /nosplash /minimized
O4 - HKCU\..\Run: [a-squared] "C:\Program Files\a-squared\a2guard.exe"
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\MSN Messenger\msnmsgr.exe" /background
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - Startup: Anti-Pub.lnk = C:\Program Files\Antipub\antipub.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: MoneySide - {E023F504-0C5A-4750-A1E7-A9046DEA8A21} - C:\Program Files\Microsoft Money\System\mnyviewer.dll
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
O16 - DPF: {74D05D43-3236-11D4-BDCD-00C04F9A3B61} (HouseCall Control) - http://a840.g.akamai.net/7/840/537 [...] scan53.cab
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/ [...] loader.cab
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - "C:\PROGRA~1\MSNMES~1\msgrapp.dll" (file missing)
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Fichiers communs\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: McAfee Framework Service (McAfeeFramework) - Network Associates, Inc. - C:\Program Files\Network Associates\Common Framework\FrameworkService.exe
O23 - Service: Network Associates McShield (McShield) - Network Associates, Inc. - C:\Program Files\Network Associates\VirusScan\Mcshield.exe
O23 - Service: Network Associates Task Manager (McTaskManager) - Network Associates, Inc. - C:\Program Files\Network Associates\VirusScan\VsTskMgr.exe
O23 - Service: MpService - Canon Inc. - C:\Program Files\Canon\MultiPASS4\MPSERVIC.EXE
O23 - Service: Sygate Personal Firewall (SmcService) - Sygate Technologies, Inc. - C:\Program Files\Sygate\SPF\smc.exe

Pouvez vous m'aider. Je n'y connais pas grand chose. :-D
Par avance merci