Merci Moe31
Voilà le résultat obtenu :

Logfile of HijackThis v1.99.1
Scan saved at 02:04:18, on 10/08/2005
Platform: Windows 2000 SP1 (WinNT 5.00.2195)
MSIE: Internet Explorer v5.00 (5.00.2920.0000)

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\SCardSvr.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\system32\spoolsv.exe
C:\WINNT\System32\svchost.exe
C:\WINNT\system32\hidserv.exe
C:\Program Files\Kerio\Personal Firewall 4\kpf4ss.exe
C:\WINNT\system32\regsvc.exe
C:\WINNT\system32\MSTask.exe
C:\WINNT\system32\stisvc.exe
C:\Program Files\Kerio\Personal Firewall 4\kpf4gui.exe
C:\WINNT\system32\usrbridg.exe
C:\WINNT\System32\WBEM\WinMgmt.exe
C:\WINNT\System32\mspmspsv.exe
C:\WINNT\explorer.exe
C:\WINNT\System32\shnlog.exe
C:\WINNT\popuper.exe
C:\WINNT\System32\msole32.exe
C:\WINNT\System32\intmonp.exe
C:\WINNT\System32\intmon.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Documents and Settings\Administrator\My Documents\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = about:blank
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://www.bestwebslinks.com/search.php?qq=%1
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://www.bestwebslinks.com/bar.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://www.bestwebslinks.com/search.php?qq=%1
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://www.bestwebslinks.com/search.php?qq=%1
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,CustomizeSearch = http://www.bestwebslinks.com/search.php?qq=%1
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://www.bestwebslinks.com/search.php?qq=%1
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page = http://www.bestwebslinks.com/
F2 - REG:system.ini: Shell=explorer.exe, msmsgs.exe
O2 - BHO: HP Class - {FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFA} - C:\WINNT\System32\hpE89A.tmp
O4 - HKLM\..\Run: [Synchronization Manager] mobsync.exe /logon
O17 - HKLM\System\CCS\Services\Tcpip\..\{0DC44FE6-ADCD-446B-8A4F-27F494FD133D}: NameServer = 81.22.90.29 82.101.136.29
O17 - HKLM\System\CS1\Services\Tcpip\..\{0DC44FE6-ADCD-446B-8A4F-27F494FD133D}: NameServer = 81.22.90.29 82.101.136.29
O23 - Service: Logical Disk Manager Administrative Service (dmadmin) - VERITAS Software Corp. - C:\WINNT\System32\dmadmin.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Kerio Personal Firewall 4 (KPF4) - Kerio Technologies - C:\Program Files\Kerio\Personal Firewall 4\kpf4ss.exe
O23 - Service: SymWMI Service (SymWSC) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\Security Center\SymWSC.exe
O23 - Service: IrBridge User-Level Interface (USRBRIDG) - Extended Systems, Inc. - C:\WINNT\system32\usrbridg.exe

Merci pour ton aide