Problem wintcp-hijack this

Bonjour,

J'ai un vieux PC sous windows XP, connecté à internet par USB (pas d'ethernet) et depuis quelques temps j'ai des problemes de déconnections où le reseau local m'indique une adresse IP invalide. Avast m'a mis un trojan en 40 aine la semaine dernière et depuis hier keryo me signale une activité débordante d'un certain wintcp. Je suis un peu perdue.
Merci d'avance à celle ou celui qui pourra m'aider dans un langage simple...

J'ai fait un log hijack this :

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 16:47:02, on 26/01/2008
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)
Boot mode: Normal

Running processes:
D:\WINDOWS\System32\smss.exe
D:\WINDOWS\system32\winlogon.exe
D:\WINDOWS\system32\services.exe
D:\WINDOWS\system32\lsass.exe
D:\WINDOWS\system32\svchost.exe
D:\WINDOWS\System32\svchost.exe
D:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
D:\Program Files\Alwil Software\Avast4\ashServ.exe
D:\WINDOWS\Explorer.EXE
D:\Program Files\Roxio\Easy CD Creator 5\DirectCD\DirectCD.exe
D:\Program Files\Java\j2re1.4.2_04\bin\jusched.exe
D:\WINDOWS\System32\spool\DRIVERS\W32X86\2\bgsmsnd.exe
D:\Program Files\iTunes\iTunesHelper.exe
D:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
D:\WINDOWS\System32\LVCOMSX.EXE
D:\Program Files\Logitech\Video\LogiTray.exe
D:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe
D:\Program Files\QuickTime\qttask.exe
D:\WINDOWS\System32\ctfmon.exe
D:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
D:\Program Files\Logitech\Video\FxSvr2.exe
D:\WINDOWS\system32\spoolsv.exe
D:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\MDM.EXE
D:\WINDOWS\System32\dllcache\wintcps.exe
D:\WINDOWS\System32\svchost.exe
D:\Program Files\Alwil Software\Avast4\ashWebSv.exe
D:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
D:\Program Files\iPod\bin\iPodService.exe
D:\WINDOWS\System32\wuauclt.exe
D:\Program Files\Sunbelt Software\Personal Firewall\kpf4ss.exe
D:\Program Files\Sunbelt Software\Personal Firewall\kpf4gui.exe
D:\Program Files\Sunbelt Software\Personal Firewall\kpf4gui.exe
D:\WINDOWS\System32\cmd.exe
D:\Program Files\Trend Micro\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.google.fr/?gws_rd=ssl
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = localhost
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - d:\program files\google\googletoolbar3.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - D:\Program Files\Google\GoogleToolbarNotifier\2.0.301.7164\swg.dll
O3 - Toolbar: pdfMachine - {0E1230F8-EA50-42A9-983C-E22ABC2EED3F} - D:\WINDOWS\System32\spool\DRIVERS\W32X86\2\bgstb.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - D:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - d:\program files\google\googletoolbar3.dll
O4 - HKLM\..\Run: [AdaptecDirectCD] "D:\Program Files\Roxio\Easy CD Creator 5\DirectCD\DirectCD.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] D:\Program Files\Java\j2re1.4.2_04\bin\jusched.exe
O4 - HKLM\..\Run: [bgsmsnd.exe] D:\WINDOWS\System32\spool\DRIVERS\W32X86\2\bgsmsnd.exe
O4 - HKLM\..\Run: [iTunesHelper] D:\Program Files\iTunes\iTunesHelper.exe
O4 - HKLM\..\Run: [avast!] D:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [LVCOMSX] D:\WINDOWS\System32\LVCOMSX.EXE
O4 - HKLM\..\Run: [LogitechVideoRepair] D:\Program Files\Logitech\Video\ISStart.exe
O4 - HKLM\..\Run: [LogitechVideoTray] D:\Program Files\Logitech\Video\LogiTray.exe
O4 - HKLM\..\Run: [!AVG Anti-Spyware] "D:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe" /minimized
O4 - HKLM\..\Run: [QuickTime Task] "D:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKCU\..\Run: [ctfmon.exe] D:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [swg] D:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
O4 - Global Startup: Adobe Gamma Loader.exe.lnk = D:\Program Files\Common Files\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Adobe Reader Speed Launch.lnk = D:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O8 - Extra context menu item: Add to Windows &Live Favorites - https://onedrive.live.com/?id=favorites
O8 - Extra context menu item: E&xport to Microsoft Excel - res://D:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {85d1f590-48f4-11d9-9669-0800200c9a66} - D:\WINDOWS\bdoscandel.exe
O9 - Extra 'Tools' menuitem: Uninstall BitDefender Online Scanner v8 - {85d1f590-48f4-11d9-9669-0800200c9a66} - D:\WINDOWS\bdoscandel.exe
O16 - DPF: {5D86DDB5-BDF9-441B-9E9E-D4730F4EE499} (BDSCANONLINE Control) - http://download.bitdefender.com/resources/scan8/oscan8.cab
O18 - Filter hijack: text/html - {4F7681E5-6CAF-478D-9CB8-4CA593BEE7FB} - D:\WINDOWS\System32\xplugin.dll
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - D:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - ALWIL Software - D:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - ALWIL Software - D:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
O23 - Service: avast! Web Scanner - ALWIL Software - D:\Program Files\Alwil Software\Avast4\ashWebSv.exe
O23 - Service: AVG Anti-Spyware Guard - Anti-Malware Development a.s. - D:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: F-Secure Windows Security Center Legacy Detection Service (Fswsclds) - Unknown owner - D:\Program Files\Securitoo\av_fw\fswsclds.exe (file missing)
O23 - Service: Google Updater Service (gusvc) - Google - D:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: iPod Service (iPodService) - Apple Computer, Inc. - D:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Sunbelt Kerio Personal Firewall 4 (KPF4) - Sunbelt Software - D:\Program Files\Sunbelt Software\Personal Firewall\kpf4ss.exe
O23 - Service: Microsoft Windows TCP Protocol - Unknown owner - D:\WINDOWS\System32\dllcache\wintcps.exe