ciao non so cosa devo eliminare dalla lista generata:
Logfile of HijackThis v1.99.0
Scan saved at 8.20.17, on 12/02/2005
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\svchost.exe
C:\WINNT\System32\svchost.exe
C:\WINNT\system32\spoolsv.exe
C:\PROGRA~1\F-Secure\BackWeb\7681197\Program\SERVIC~1.EXE
C:\Program Files\F-Secure\Anti-Virus\fsgk32st.exe
C:\Program Files\F-Secure\Anti-Virus\FSGK32.EXE
C:\Program Files\F-Secure\Anti-Virus\fssm32.exe
C:\Program Files\Common Files\Microsoft Shared\VS7Debug\mdm.exe
C:\WINNT\system32\regsvc.exe
C:\WINNT\system32\MSTask.exe
C:\Program Files\F-Secure\BackWeb\7681197\Program\BackWeb-7681197.exe
C:\WINNT\System32\WBEM\WinMgmt.exe
C:\WINNT\system32\svchost.exe
C:\Program Files\F-Secure\Common\FSMA32.EXE
C:\Program Files\F-Secure\Common\FSMB32.EXE
C:\Program Files\F-Secure\Common\FCH32.EXE
C:\Program Files\F-Secure\Common\FAMEH32.EXE
C:\Program Files\F-Secure\Common\FNRB32.EXE
C:\Program Files\F-Secure\Common\FIH32.EXE
C:\Program Files\F-Secure\Anti-Virus\fsav32.exe
C:\WINNT\Explorer.Exe
C:\Program Files\F-Secure\Common\FSM32.EXE
C:\WINNT\AGRSMMSG.exe
C:\WINNT\system32\igfxtray.exe
C:\WINNT\system32\hkcmd.exe
C:\WINNT\system32\rundll32.exe
C:\WINNT\system32\ctfmon.exe
C:\Program Files\Microsoft Office\Office10\OUTLOOK.EXE
C:\WINNT\msagent\AgentSvr.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Documents and Settings\msorv10\Local Settings\Temp\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = about:blank
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://omnibase/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = about:blank
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,SearchAssistant = about:blank
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = about:blank
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = http://omnibase
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,AutoConfigURL = http://omnipac/apc/omninet.pac
O2 - BHO: PCTools Site Guard - {5C8B2A36-3DB1-42A4-A3CB-D426709BBFEB} - C:\PROGRA~1\SPYWAR~1\tools\iesdsg.dll (file missing)
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINNT\System32\msdxm.ocx
O4 - HKLM\..\Run: [Synchronization Manager] mobsync.exe /logon
O4 - HKLM\..\Run: [F-Secure Manager] "C:\Program Files\F-Secure\Common\FSM32.EXE" /splash
O4 - HKLM\..\Run: [ATIModeChange] Ati2mdxx.exe
O4 - HKLM\..\Run: [AGRSMMSG] AGRSMMSG.exe
O4 - HKLM\..\Run: [RegServer] regserve.exe
O4 - HKLM\..\Run: [TridentWatchDog] twatdog.exe
O4 - HKLM\..\Run: [IgfxTray] C:\WINNT\system32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINNT\system32\hkcmd.exe
O4 - HKLM\..\Run: [sp] rundll32 C:\DOCUME~1\msorv10\LOCALS~1\Temp\se.dll,DllInstall
O4 - HKCU\..\Run: [ctfmon.exe] ctfmon.exe
O4 - HKCU\..\Run: [Spyware Doctor] "C:\Program Files\Spyware Doctor\swdoctor.exe" /Q
O4 - HKCU\..\Run: [Spyware Begone] c:\freescan\freescan.exe -FastScan
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel present
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O15 - Trusted Zone: *.omnitel.it
O15 - Trusted Zone: *.vodafone.it
O17 - HKLM\System\CCS\Services\Tcpip\Parameters: Domain = omnitel.it
O17 - HKLM\System\CCS\Services\Tcpip\..\{65FD87CA-AAEC-4613-AB35-10BBDDEBB5B3}: Domain = omnitel.it
O17 - HKLM\System\CS1\Services\Tcpip\Parameters: Domain = omnitel.it
O17 - HKLM\System\CS2\Services\Tcpip\Parameters: Domain = omnitel.it
O23 - Service: Ati HotKey Poller - Unknown - C:\WINNT\system32\Ati2evxx.exe
O23 - Service: F-Secure BackWeb - Unknown - C:\PROGRA~1\F-Secure\BackWeb\7681197\Program\SERVIC~1.EXE
O23 - Service: Logical Disk Manager Administrative Service - VERITAS Software Corp. - C:\WINNT\System32\dmadmin.exe
O23 - Service: F-Secure BackWeb LAN Access - Unknown - C:\Program Files\F-Secure\BackWeb\7681197\Program\fsbwlan.exe
O23 - Service: F-Secure Gatekeeper Handler Starter - Unknown - C:\Program Files\F-Secure\Anti-Virus\fsgk32st.exe
O23 - Service: F-Secure Network Request Broker - F-Secure Corporation - C:\Program Files\F-Secure\Common\FNRB32.EXE
O23 - Service: F-Secure Authentication Agent - F-Secure Corporation. All Rights Reserved. - C:\Program Files\F-Secure\Common\FSAA.EXE
O23 - Service: F-Secure Management Agent - F-Secure Corporation - C:\Program Files\F-Secure\Common\FSMA32.EXE

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 = about:blank
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://omnibase/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = about:blank
R1 - HKCU\Software\Microsoft\Internet Explorer\Search,SearchAssistant = about:blank
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = about:blank
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = http://omnibase
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,AutoConfigURL = http://omnipac/apc/omninet.pac
O2 - BHO: PCTools Site Guard - {5C8B2A36-3DB1-42A4-A3CB-D426709BBFEB} - C:\PROGRA~1\SPYWAR~1\tools\iesdsg.dll (file missing)
-
O4 - HKLM\..\Run: [RegServer] regserve.exe
O4 - HKLM\..\Run: [TridentWatchDog] twatdog.exe
-
O4 - HKLM\..\Run: [sp] rundll32 C:\DOCUME~1\msorv10\LOCALS~1\Temp\se.dll,DllInstall
==================================

Con la funzione TROVA di Windows, cerca ed elimina questi file,

==================================
regserve.exe
twatdog.exe
se.dll
==================================

al termine utilizza i programmi 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.

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Collaboratore Aiutamici