J'ai une fenetre instantsearch.cc ???

Logfile of HijackThis v1.99.1
Scan saved at 17:02:01, on 01/04/2005
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\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\Explorer.EXE
C:\WINDOWS\Mixer.exe
C:\Program Files\Winamp\winampa.exe
C:\Program Files\Fichiers communs\Logitech\QCDriver3\LVCOMS.EXE
C:\Program Files\Logitech\ImageStudio\LogiTray.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\eMule\emule.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\WinRAR\WinRAR.exe
C:\DOCUME~1\PCDEKA~1\LOCALS~1\Temp\Rar$EX00.857\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = about:blank
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch = about:blank
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = about:blank
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar2.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar2.dll
O4 - HKLM\..\Run: [C-Media Mixer] Mixer.exe /startup
O4 - HKLM\..\Run: [NeroCheck] C:\WINDOWS\system32\\NeroCheck.exe
O4 - HKLM\..\Run: [WinampAgent] C:\Program Files\Winamp\winampa.exe
O4 - HKLM\..\Run: [LVCOMS] C:\Program Files\Fichiers communs\Logitech\QCDriver3\LVCOMS.EXE
O4 - HKLM\..\Run: [LogitechGalleryRepair] C:\Program Files\Logitech\ImageStudio\ISStart.exe
O4 - HKLM\..\Run: [LogitechImageStudioTray] C:\Program Files\Logitech\ImageStudio\LogiTray.exe
O4 - HKLM\..\Run: [Security iGuard] C:\Program Files\Security iGuard\Security iGuard.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: Logitech Desktop Messenger.lnk = C:\Program Files\Logitech\Desktop Messenger\8876480\Program\LDMConf.exe
O8 - Extra context menu item: &Google Search - res://c:\program files\google\GoogleToolbar2.dll/cmsearch.html
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O8 - Extra context menu item: Pages liées - res://c:\program files\google\GoogleToolbar2.dll/cmbacklinks.html
O8 - Extra context menu item: Pages similaires - res://c:\program files\google\GoogleToolbar2.dll/cmsimilar.html
O8 - Extra context menu item: Version de la page actuelle disponible dans le cache Google - res://c:\program files\google\GoogleToolbar2.dll/cmcache.html
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
O9 - Extra button: Microsoft AntiSpyware helper - {CF2F8DC9-9988-44DF-AB6C-83BD8F0AD699} - (no file) (HKCU)
O9 - Extra 'Tools' menuitem: Microsoft AntiSpyware helper - {CF2F8DC9-9988-44DF-AB6C-83BD8F0AD699} - (no file) (HKCU)
O12 - Plugin for .mov: C:\Program Files\Internet Explorer\PLUGINS\npqtplugin.dll
O12 - Plugin for .tiff: C:\Program Files\Internet Explorer\PLUGINS\npqtplugin3.dll
O16 - DPF: {74D05D43-3236-11D4-BDCD-00C04F9A3B61} (HouseCall Control) - http://a840.g.akamai.net/7/840/537/2004061001/housecall.trendmicro.com/housecall/xscan53.cab

please help me, en plus de ces fenêtres qui s'ouvrent, depuis hier, je ne peut plus acceder à internet alors que tout fonctionne, je suis bien connectée, merci de m'aider