Bonjour,
j'ai vu que je ne suis pas le seul à avoir ce problème et en plus il apparait n'importe quand lorsqu'on surf et si c'est mes enfants ils me font un chantier sur le pc.
J'ai essayé les procédures décrites mais je dois me planter.
Au cas ou quelqu'un pouvait m'aider je colle un rapport ( mon premier) soyez indulgent merci.

Logfile of HijackThis v1.99.1
Scan saved at 18:51:56, on 02/08/2006
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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
C:\Program Files\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\System32\drivers\CDAC11BA.EXE
C:\Program Files\ewido anti-spyware 4.0\guard.exe
C:\WINDOWS\System32\tcpsvcs.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\ZoneLabs\vsmon.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\explorer.exe
C:\Program Files\D-Tools\daemon.exe
C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
C:\PROGRA~1\ZONELA~1\ZONEAL~1\zlclient.exe
C:\Program Files\Java\jre1.5.0_06\bin\jusched.exe
C:\WINDOWS\system32\RunDll32.exe
C:\WINDOWS\system32\wuauclt.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Hewlett-Packard\Digital Imaging\bin\hpotdd01.exe
C:\Program Files\Antipub\antipub.exe
C:\Program Files\Lavasoft Ad-Aware\Ad-aware.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Documents and Settings\chée et ché\Bureau\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.fr/
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyServer = ftp=192.168.0.35:21;http=192.168.0.35:6588;https=192.168.0.35:6588;socks=192.168.0.35:1080
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
F2 - REG:system.ini: Shell=explorer.exe
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O4 - HKLM\..\Run: [DAEMON Tools-1033] "C:\Program Files\D-Tools\daemon.exe" -lang 1033 -lock
O4 - HKLM\..\Run: [ATIPTA] C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKLM\..\Run: [Zone Labs Client] C:\PROGRA~1\ZONELA~1\ZONEAL~1\zlclient.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\jre1.5.0_06\bin\jusched.exe
O4 - HKLM\..\Run: [Cmaudio] RunDll32 cmicnfg.cpl,CMICtrlWnd
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [!ewido] "C:\Program Files\ewido anti-spyware 4.0\ewido.exe" /minimized
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - Startup: Anti-Pub.lnk = C:\Program Files\Antipub\antipub.exe
O4 - Global Startup: hpoddt01.exe.lnk = ?
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~3\Office10\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O9 - Extra button: Joyo - {8DE0FCD4-5EB5-11D3-AD25-00002100131B} - C:\PROGRA~1\NET2SOFT\ANTI-H~1\IEPlugin.dll
O9 - Extra button: PowerWord - {C8CE29C5-7589-11D3-B81B-0080C8DC5DC8} - C:\PROGRA~1\NET2SOFT\ANTI-H~1\IEPlugin.dll
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
O16 - DPF: {14B87622-7E19-4EA8-93B3-97215F77A6BC} (MessengerStatsClient Class) - http://messenger.zone.msn.com/bina [...] b31267.cab
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O16 - DPF: {2917297F-F02B-4B9D-81DF-494B6333150B} (Minesweeper Flags Class) - http://messenger.zone.msn.com/bina [...] b31267.cab
O16 - DPF: {5D86DDB5-BDF9-441B-9E9E-D4730F4EE499} (BDSCANONLINE Control) - http://www.bitdefender.fr/scan8/oscan8.cab
O16 - DPF: {8E0D4DE5-3180-4024-A327-4DFAD1796A8D} (MessengerStatsClient Class) - http://messenger.zone.msn.com/bina [...] b31267.cab
O16 - DPF: {94EB57FE-2720-496C-B33F-D9353C6E23F7} (F-Secure Online Scanner 2.1) - http://support.f-secure.com/ols/fscax.cab
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://acs.pandasoftware.com/activ [...] asinst.cab
O16 - DPF: {B8BE5E93-A60C-4D26-A2DC-220313175592} (ZoneIntro Class) - http://messenger.zone.msn.com/bina [...] b32846.cab
O16 - DPF: {F6BF0D00-0B2A-4A75-BF7B-F385591623AF} (Solitaire Showdown Class) - http://messenger.zone.msn.com/bina [...] b31267.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{52217EB1-9676-424D-91A1-865195862F07}: NameServer = 212.27.32.176,212.27.32.177
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - Unknown owner - C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: Ati HotKey Poller - Unknown owner - C:\WINDOWS\System32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.exe
O23 - Service: avast! Antivirus - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: C-DillaCdaC11BA - Macrovision - C:\WINDOWS\System32\drivers\CDAC11BA.EXE
O23 - Service: ewido anti-spyware 4.0 guard - Anti-Malware Development a.s. - C:\Program Files\ewido anti-spyware 4.0\guard.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\System32\HPZipm12.exe
O23 - Service: rpcapd - Unknown owner - %ProgramFiles%\WinPcap\rpcapd.exe" -d -f "%ProgramFiles%\WinPcap\rpcapd.ini (file missing)
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Unknown owner - C:\Program Files\Fichiers communs\Symantec Shared\SNDSrvc.exe (file missing)
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs Inc. - C:\WINDOWS\system32\ZoneLabs\vsmon.exe

HELP ( cela c'est moi ce n'est plus le rapport ) :-D