Probleme de lenteur avec internet Firefox IE

Bonjour,
J'ai besoin d'aide svp , internet est lent et je pense que c'est du a un quelconque virus ou autre trojan mais j'aimerai que l'on me conseille car j'ai deja essayé quelque manip sans résultat. Je ne pense pas que le probleme vien de ma connexions puisque mon debit est normal ( test sur le site de free ). Merci d'avance a +

Je vous poste mon rapport hijackthis :

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 18:43:23, on 01/09/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
Boot mode: Normal

Running processes:
I:\WINDOWS\System32\smss.exe
I:\WINDOWS\system32\winlogon.exe
I:\WINDOWS\system32\services.exe
I:\WINDOWS\system32\lsass.exe
I:\WINDOWS\system32\svchost.exe
I:\WINDOWS\System32\svchost.exe
I:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
I:\Program Files\Alwil Software\Avast4\ashServ.exe
I:\WINDOWS\system32\spoolsv.exe
I:\WINDOWS\system32\nvsvc32.exe
I:\WINDOWS\system32\PnkBstrA.exe
I:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
I:\Program Files\Alwil Software\Avast4\ashWebSv.exe
I:\WINDOWS\Explorer.EXE
I:\Program Files\ANI\ANIWZCS2 Service\WZCSLDR2.exe
I:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
I:\WINDOWS\system32\RUNDLL32.EXE
I:\WINDOWS\SOUNDMAN.EXE
I:\WINDOWS\system32\ctfmon.exe
I:\WINDOWS\system32\wuauclt.exe
I:\Program Files\Windows Live\Messenger\usnsvc.exe
I:\Program Files\Xfire\xfire.exe
I:\Program Files\Spybot - Search & Destroy\SpybotSD.exe
I:\Program Files\Mozilla Firefox\firefox.exe
I:\Documents and Settings\emil\Bureau\HiJackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.google.fr/?gws_rd=ssl
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - I:\Program Files\Fichiers communs\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - I:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Programme d'aide de l'Assistant de connexion Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - I:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Windows Live Toolbar Helper - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - I:\Program Files\Windows Live Toolbar\msntb.dll
O2 - BHO: (no name) - {FDD3B846-8D59-4ffb-8758-209B6AD74ACC} - (no file)
O3 - Toolbar: Windows Live Toolbar - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - I:\Program Files\Windows Live Toolbar\msntb.dll
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE I:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [ANIWZCS2Service] I:\Program Files\ANI\ANIWZCS2 Service\WZCSLDR2.exe
O4 - HKLM\..\Run: [avast!] I:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE I:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKCU\..\Run: [CTFMON.EXE] I:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [msnmsgr] "I:\Program Files\Windows Live\Messenger\msnmsgr.exe" /background
O8 - Extra context menu item: &Windows Live Search - res://I:\Program Files\Windows Live Toolbar\msntb.dll/search.htm
O8 - Extra context menu item: Add to Windows &Live Favorites - https://onedrive.live.com/?id=favorites
O9 - Extra button: Ajout Direct - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - I:\Program Files\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra 'Tools' menuitem: &Ajout Direct dans Windows Live Writer - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - I:\Program Files\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - I:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search & Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - I:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - I:\Program Files\Messenger\msmsgs.exe (file missing)
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - I:\Program Files\Messenger\msmsgs.exe (file missing)
O23 - Service: ANIWZCSd Service (ANIWZCSdService) - Wireless Service - I:\Program Files\ANI\ANIWZCS2 Service\ANIWZCSdS.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - I:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - ALWIL Software - I:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - ALWIL Software - I:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
O23 - Service: avast! Web Scanner - ALWIL Software - I:\Program Files\Alwil Software\Avast4\ashWebSv.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - I:\WINDOWS\system32\nvsvc32.exe
O23 - Service: PnkBstrA - Unknown owner - I:\WINDOWS\system32\PnkBstrA.exe