Internet se charge plus les pages

Bonjour,
J'ai eu beau cherché sur differents forums je n'ai pas trouvé la solution à mon probleme. Voila, je peux surfer un certain temps mais parfois soit les pages ne se chargent plus, soit les videos (par exemple: youtube ou jeuxvideo.com) ne se lancent plus non plus. J'ai fait un scan avec Hijackthis mais je sais pas decoder les résultats.
Le voici dans l'espoir que quelqu'un pourra m'aider ou du moins en aura le temps.

Logfile of HijackThis v1.99.1
Scan saved at 14:06:51, on 09/11/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16735)

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
D:\Avast\aswUpdSv.exe
C:\WINDOWS\Explorer.EXE
D:\Avast\ashServ.exe
C:\WINDOWS\system32\RUNDLL32.EXE
C:\Program Files\Saitek\Software\ProfilerU.exe
C:\Program Files\Saitek\Software\SaiMfd.exe
C:\WINDOWS\RTHDCPL.EXE
D:\Avast\ashDisp.exe
C:\Program Files\QuickTime\qttask.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\WINDOWS\system32\ctfmon.exe
D:\prhyper.exe
C:\Program Files\Windows Live\Messenger\msnmsgr.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Common Files\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
C:\WINDOWS\system32\drivers\KodakCCS.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\WINDOWS\system32\PnkBstrA.exe
D:\Alcohol 120\StarWind\StarWindService.exe
D:\Avast\ashMaiSv.exe
D:\Avast\ashWebSv.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Program Files\Common Files\Microsoft Shared\Windows Live\WLLoginProxy.exe
C:\Program Files\Spybot - Search & Destroy\SpybotSD.exe
C:\Program Files\Lavasoft\Ad-Aware\aawservice.exe
C:\Program Files\Lavasoft\Ad-Aware\Ad-Aware.exe
C:\Program Files\Internet Explorer\iexplore.exe
F:\Download\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://outlook.live.com/owa/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = https://www.msn.com/fr-fr/?ocid=iehp
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.msn.com/fr-fr/?ocid=iehp
O2 - BHO: XBTP05231 - {031F120A-BBAF-45d8-B306-375F2A6B9398} - C:\PROGRA~1\ALCOHO~1\ALCOHO~1\a120_tb.dll
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - D:\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_06\bin\ssv.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} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O3 - Toolbar: Alcohol Soft - Alcohol 120% Toolbar - {1CE4EE89-2D5C-4361-AF3B-D902AB545381} - C:\Program Files\Alcohol Soft\Alcohol 120% Toolbar\a120_tb.dll
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\System32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [Profiler] C:\Program Files\Saitek\Software\ProfilerU.exe
O4 - HKLM\..\Run: [SaiMfd] C:\Program Files\Saitek\Software\SaiMfd.exe
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [Alcmtr] ALCMTR.EXE
O4 - HKLM\..\Run: [JMB36X IDE Setup] C:\WINDOWS\RaidTool\xInsIDE.exe
O4 - HKLM\..\Run: [36X Raid Configurer] C:\WINDOWS\System32\xRaidSetup.exe boot
O4 - HKLM\..\Run: [avast!] D:\Avast\ashDisp.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe" -osboot
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [Le Petit Robert Hyperappel] D:\prhyper.exe
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\Windows Live\Messenger\msnmsgr.exe" /background
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_06\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_06\bin\ssv.dll
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search & Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
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
O11 - Options group: [INTERNATIONAL] International*
O16 - DPF: {8AD9C840-044E-11D1-B3E9-00805F499D93} (Java Runtime Environment 1.6.0) - http://dl8-cdn-01.sun.com/s/ESD42/JSCDL/jre/6u6-b90/jinstall-6u6-windows-i586-jc.cab?e=1212765353052&h=bfe65b2ae278a062a886ae12c2d9415b/&filename=jinstall-6u6-windows-i586-jc.cab
O16 - DPF: {A73BAEFA-EE65-494D-BEDB-DD3E5A34FA98} (Image Uploader) - http://www.extrafilm.fr/ImageUploader4.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{49D4843F-2EA8-4624-BA0E-714201B43B1D}: NameServer = 212.27.53.252,212.27.54.252
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\WINDOW~4\MESSEN~1\MSGRAP~1.DLL
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\WINDOW~4\MESSEN~1\MSGRAP~1.DLL
O18 - Protocol: wlmailhtml - {03C514A3-1EFB-4856-9F99-10D7BE1653C0} - C:\Program Files\Windows Live\Mail\mailcomm.dll
O23 - Service: Lavasoft Ad-Aware Service (aawservice) - Lavasoft - C:\Program Files\Lavasoft\Ad-Aware\aawservice.exe
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files\Common Files\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - D:\Avast\aswUpdSv.exe
O23 - Service: avast! Antivirus - ALWIL Software - D:\Avast\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - D:\Avast\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - D:\Avast\ashWebSv.exe" /service (file missing)
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: Service de l'iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Kodak Camera Connection Software (KodakCCS) - Eastman Kodak Company - C:\WINDOWS\system32\drivers\KodakCCS.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: PnkBstrA - Unknown owner - C:\WINDOWS\system32\PnkBstrA.exe
O23 - Service: Sony SPTI Service (SPTISRV) - Sony Corporation - C:\PROGRA~1\COMMON~1\SONYSH~1\AVLib\Sptisrv.exe
O23 - Service: StarWind iSCSI Service (StarWindService) - Rocket Division Software - D:\Alcohol 120\StarWind\StarWindService.exe

Merci à l'avance!