ciao alfonso,
ti ho scritto già una volta per un computer che aveva dei problemi (veniva impostata un pagina predefinita), purtroppo si è ripresentato di nuovo un simile problema per un altro computer:
os 2000 professional pagina impostata www.buldog-search.com
log
Logfile of HijackThis v1.98.2
Scan saved at 2.06.52, on 07/01/2005
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\svchost.exe
C:\WINNT\system32\spoolsv.exe
C:\WINNT\System32\ati2evxx.exe
C:\Programmi\AVPersonal\AVWUPSRV.EXE
C:\WINNT\System32\svchost.exe
C:\Program Files\AMD\PowerNow!\GemServ.exe
C:\Program Files\AMD\PowerNow!\gemback.exe
C:\Programmi\File comuni\Microsoft Shared\VS7Debug\mdm.exe
C:\WINNT\system32\regsvc.exe
C:\WINNT\system32\MSTask.exe
C:\WINNT\system32\ZONELABS\vsmon.exe
C:\WINNT\System32\WBEM\WinMgmt.exe
C:\WINNT\Explorer.exe
D:\Programmi\Zone Labs\ZoneAlarm\zlclient.exe
C:\WINNT\System32\Atiptaxx.exe
C:\Programmi\File comuni\Real\Update_OB\realsched.exe
C:\Programmi\iTunes\iTunesHelper.exe
C:\Programmi\QuickTime\qttask.exe
C:\WINNT\System32\rundll32.exe
C:\WINNT\System32\ctfmon.exe
C:\WINNT\hhnt.exe
C:\Programmi\iPod\bin\iPodService.exe
C:\Programmi\Compaq\Common\Bin\WinCinemaMgr.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Documents and Settings\Administrator\Documenti\prog\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://www.buldog-search.com/
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.buldog-search.com/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://it.msn.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O1 - Hosts: 69.50.188.82 google.com
O1 - Hosts: 69.50.188.82 altavista.com
O1 - Hosts: 69.50.188.82 www.altavista.com
O1 - Hosts: 69.50.188.82 msn.com
O1 - Hosts: 69.50.188.82 www.msn.com
O1 - Hosts: 69.50.188.82 search.msn.com
O1 - Hosts: 69.50.188.82 search.yahoo.com
O1 - Hosts: 69.50.188.82 yahoo.com
O1 - Hosts: 69.50.188.82 www.yahoo.com
O1 - Hosts: 69.50.188.82 search.aol.com
O1 - Hosts: 69.50.188.82 askjeeves.com
O1 - Hosts: 69.50.188.82 www.askjeeves.com
O1 - Hosts: 69.50.188.82 www.directhit.com
O1 - Hosts: 69.50.188.82 directhit.com
O1 - Hosts: 69.50.188.82 www.excite.com
O1 - Hosts: 69.50.188.82 excite.com
O1 - Hosts: 69.50.188.82 alltheweb.com
O1 - Hosts: 69.50.188.82 www.alltheweb.com
O1 - Hosts: 69.50.188.82 go.com
O1 - Hosts: 69.50.188.82 www.go.com
O1 - Hosts: 69.50.188.82 goto.com
O1 - Hosts: 69.50.188.82 www.goto.com
O1 - Hosts: 69.50.188.82 hotbot.com
O1 - Hosts: 69.50.188.82 www.hotbot.com
O1 - Hosts: 69.50.188.82 lycos.com
O1 - Hosts: 69.50.188.82 www.lycos.com
O1 - Hosts: 69.50.188.82 dmoz.org
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Programmi\Spybot - Search & Destroy\SDHelper.dll
O3 - Toolbar: @msdxmLC.dll,-1@1040,&Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINNT\System32\msdxm.ocx
O4 - HKLM\..\Run: [Synchronization Manager] mobsync.exe /logon
O4 - HKLM\..\Run: [Zone Labs Client] "D:\Programmi\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKLM\..\Run: [AtiPTA] Atiptaxx.exe
O4 - HKLM\..\Run: [TkBellExe] "C:\Programmi\File comuni\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [iTunesHelper] C:\Programmi\iTunes\iTunesHelper.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKCU\..\Run: [ctfmon.exe] ctfmon.exe
O4 - HKCU\..\Run: [MSAgent] C:\WINNT\hhnt.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: InterVideo WinCinema Manager.lnk = C:\Programmi\Compaq\Common\Bin\WinCinemaMgr.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O16 - DPF: {F5C90925-ABBF-4475-88F5-8622B452BA9E} (Compaq System Data Class) - http://h30155.www3.hp.com/helpandsupport/SysQuery.cab

ho seguito le istruzioni sul vostro sito per la rimozione dei file e dopo sucessivi tentativi e spuntando l'opzione visualizza cartelle e file nascosti
e deselezionando nascondi i file protetti di sistema ho eseguito mod.provvisoria cancellato i file e ho eseguito di nuovo il log in modalita normale
Logfile of HijackThis v1.98.2
Scan saved at 0.39.42, on 07/01/2005
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\svchost.exe
C:\WINNT\system32\spoolsv.exe
C:\WINNT\System32\ati2evxx.exe
C:\Programmi\AVPersonal\AVWUPSRV.EXE
C:\WINNT\System32\svchost.exe
C:\Program Files\AMD\PowerNow!\GemServ.exe
C:\Program Files\AMD\PowerNow!\gemback.exe
C:\Programmi\File comuni\Microsoft Shared\VS7Debug\mdm.exe
C:\WINNT\system32\regsvc.exe
C:\WINNT\system32\MSTask.exe
C:\WINNT\system32\ZONELABS\vsmon.exe
C:\WINNT\System32\WBEM\WinMgmt.exe
C:\WINNT\Explorer.exe
D:\Programmi\Zone Labs\ZoneAlarm\zlclient.exe
C:\WINNT\System32\Atiptaxx.exe
C:\Programmi\File comuni\Real\Update_OB\realsched.exe
C:\Programmi\iTunes\iTunesHelper.exe
C:\Programmi\QuickTime\qttask.exe
C:\WINNT\System32\rundll32.exe
C:\WINNT\System32\ctfmon.exe
C:\Programmi\Compaq\Common\Bin\WinCinemaMgr.exe
C:\Programmi\iPod\bin\iPodService.exe
C:\Documents and Settings\Administrator\Documenti\prog\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://www.buldog-search.com/
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.buldog-search.com/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://it.msn.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Programmi\Spybot - Search & Destroy\SDHelper.dll
O3 - Toolbar: @msdxmLC.dll,-1@1040,&Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINNT\System32\msdxm.ocx
O4 - HKLM\..\Run: [Synchronization Manager] mobsync.exe /logon
O4 - HKLM\..\Run: [Zone Labs Client] "D:\Programmi\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKLM\..\Run: [AtiPTA] Atiptaxx.exe
O4 - HKLM\..\Run: [TkBellExe] "C:\Programmi\File comuni\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [iTunesHelper] C:\Programmi\iTunes\iTunesHelper.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKCU\..\Run: [ctfmon.exe] ctfmon.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: InterVideo WinCinema Manager.lnk = C:\Programmi\Compaq\Common\Bin\WinCinemaMgr.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O14 - IERESET.INF: START_PAGE_URL=http://it.msn.com
O14 - IERESET.INF: MS_START_PAGE_URL=http://it.msn.com
O16 - DPF: {F5C90925-ABBF-4475-88F5-8622B452BA9E} (Compaq System Data Class) - http://h30155.www3.hp.com/helpandsupport/SysQuery.cab
il problema sembra risolto ma ho come un screen saver il seguente
Warning you're in danger all you do with computer is stored ecc.ecc.con un lnk alla fine removal instruction
non so cosa fare
a presto

Ciao ,
esegui queste operazioni

riavvia in modalità provvisoria, leggi qui come fare
http://www.aiutamici.com/software/view.asp?tipo=home&CodSw=344&SH=N

apri HIJAC THIS ed elimina come indicato in questo articolo
http://www.aiutamici.com/software/descrizione.asp?CodSw=1175
le righe che seguono, (nel caso le righe da eliminare non compaiono in modalità provvisoria, eliminale dalla modalità normale e riavvia il computer).

==================================
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://www.buldog-search.com/
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.buldog-search.com/
==================================

al termine utilizza i programma AD-AWARE e SPYBOT indicati in questo articolo
http://www.aiutamici.com/software/view.asp?tipo=home&CodSw=388&SH=N

sempre in modalità provvisoria fai una scansione Antivirus.

Poi scarica la nuova versione di Hijack e rimanda il nuovo log se il problema non viene risolto
http://www.aiutamici.com/software/descrizione.asp?CodSw=1175

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Collaboratore Aiutamici