explorer.exe plante et redemmare sans cesse

bonjour,
dès le demarrage, explorer prend toutes les ressources, pui plante, et redemmare, toutes les 3 secondes.
pas de bureau disponible. je ne peut travailler qu'avec iexplorer
j'ai deja vu des posts similaires, sans succés

je vous soumet un hijackthis , en esperant qu'il vous inspire

Logfile of HijackThis v1.99.1
Scan saved at 13:23:24, on 26/02/2006
Platform: Windows 2000 SP4 (WinNT 5.00.2195)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

Running processes:
C:\WINNT\System32\smss.exe
C:\WINNT\system32\winlogon.exe
C:\WINNT\system32\services.exe
C:\WINNT\system32\lsass.exe
C:\WINNT\system32\Ati2evxx.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\system32\spoolsv.exe
C:\Program Files\Avast4\aswUpdSv.exe
C:\Program Files\Avast4\ashServ.exe
C:\WINNT\System32\svchost.exe
C:\WINNT\System32\FTRTSVC.exe
C:\WINNT\system32\regsvc.exe
C:\WINNT\system32\MSTask.exe
C:\WINNT\system32\stisvc.exe
C:\WINNT\system32\ZoneLabs\vsmon.exe
C:\WINNT\system32\Ati2evxx.exe
C:\WINNT\System32\WBEM\WinMgmt.exe
C:\WINNT\System32\MsPMSPSv.exe
C:\Program Files\Wanadoo\EspaceWanadoo.exe
C:\Program Files\Wanadoo\ComComp.exe
C:\PROGRA~1\Wanadoo\Toaster.exe
C:\PROGRA~1\Wanadoo\Inactivity.exe
C:\PROGRA~1\Wanadoo\PollingModule.exe
C:\WINNT\System32\ALERTM~1\ALERTM~1.EXE
C:\Program Files\Avast4\ashWebSv.exe
C:\Program Files\Avast4\ashMaiSv.exe
C:\Program Files\Wanadoo\Watch.exe
C:\PROGRA~1\Wanadoo\WOOBrowser\WOOBrowser.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Documents and Settings\Administrateur\Mes documents\downlooads & favoris\securité\killbox\KillBox.exe
C:\WINNT\system32\NOTEPAD.EXE
C:\Program Files\Avast4\ashSimpl.exe
C:\WINNT\system32\taskmgr.exe
C:\WINNT\explorer.exe
C:\Program Files\hija\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Wanadoo
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
R3 - URLSearchHook: Search Class - {08C06D61-F1F3-4799-86F8-BE1A89362C85} - C:\PROGRA~1\Wanadoo\SEARCH~1.DLL
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O4 - HKLM\..\Run: [NeroCheck] C:\WINNT\system32\NeroCheck.exe
O4 - HKLM\..\Run: [Synchronization Manager] mobsync.exe /logon
O4 - HKCU\..\Run: [WOOKIT] C:\Program Files\Wanadoo\GestMaj.exe EspaceWanadoo.exe
O4 - HKCU\..\Run: [Shareaza] "C:\Program Files\Shareaza\Shareaza.exe" -tray
O4 - Startup: PowerReg Scheduler.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=48835
O16 - DPF: {D28C3640-A6D7-4668-A53C-07A9CF67D157} (CFnacComposantCtrl Object) - http://www.fnacmusic.com/telechargementFnacmusic/FnacCo...
O16 - DPF: {DB893839-10F0-4AF9-92FA-B23528F530AF} - http://deposito.hostance.net/dialer/604852.exe
O17 - HKLM\System\CCS\Services\Tcpip\..\{4B25FE4F-7181-48C5-BBFD-8F54CBD39D9B}: NameServer = 80.10.246.130 80.10.246.3
O18 - Filter: text/html - {2AB289AE-4B90-4281-B2AE-1F4BB034B647} - (no file)
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - Unknown owner - C:\Program Files\Avast4\aswUpdSv.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINNT\system32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINNT\system32\ati2sgag.exe
O23 - Service: avast! Antivirus - Unknown owner - C:\Program Files\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - C:\Program Files\Avast4\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - C:\Program Files\Avast4\ashWebSv.exe" /service (file missing)
O23 - Service: Service d'administration du Gestionnaire de disque logique (dmadmin) - VERITAS Software Corp. - C:\WINNT\System32\dmadmin.exe
O23 - Service: France Telecom Routing Table Service (FTRTSVC) - France Telecom - C:\WINNT\System32\FTRTSVC.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs, LLC - C:\WINNT\system32\ZoneLabs\vsmon.exe

merci d'avance