di seguito il log da controllare
grazie luciano:

Logfile of HijackThis v1.99.0
Scan saved at 9.01.54, on 05/01/2005
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\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Alwil Software\Avast4ANTIVIRUS\aswUpdSv.exe
C:\Programmi\Alwil Software\Avast4ANTIVIRUS\ashServ.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\ssoftsrv.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\GSICON.EXE
C:\WINDOWS\system32\dslagent.exe
C:\Programmi\File comuni\Real\Update_OB\realsched.exe
C:\PROGRA~1\ALWILS~1\AVAST4~1\ashDisp.exe
C:\Programmi\QuickTime\qttask.exe
C:\Programmi\HighCriteria\TotalRecorder\TotRecSched.exe
C:\Programmi\Alwil Software\Avast4ANTIVIRUS\ashMaiSv.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Programmi\Microsoft Office\Office\OUTLOOK.EXE
C:\DOCUME~1\ADMINI~1\IMPOST~1\Temp\Directory temporanea 2 per hijackthis.zip\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.virgilio.it/home/index.html
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\programmi\google\googletoolbar1.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\programmi\google\googletoolbar1.dll
O4 - HKLM\..\Run: [GSICONEXE] GSICON.EXE
O4 - HKLM\..\Run: [DSLAGENTEXE] dslagent.exe USB
O4 - HKLM\..\Run: [TkBellExe] "C:\Programmi\File comuni\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\AVAST4~1\ashDisp.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [TotalRecorderScheduler] "C:\Programmi\HighCriteria\TotalRecorder\TotRecSched.exe"
O8 - Extra context menu item: &Google Search - res://c:\programmi\google\GoogleToolbar1.dll/cmsearch.html
O8 - Extra context menu item: Collegamenti a ritroso - res://c:\programmi\google\GoogleToolbar1.dll/cmbacklinks.html
O8 - Extra context menu item: Pagine simili - res://c:\programmi\google\GoogleToolbar1.dll/cmsimilar.html
O8 - Extra context menu item: Versione cache della pagina - res://c:\programmi\google\GoogleToolbar1.dll/cmcache.html
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O16 - DPF: {4D7F48C0-CB49-4EA6-97D4-04F4EACC2F3B} - http://sib1.od2.com/common/Member/ClientInstall/10.01.0004/OCI/setup.exe
O16 - DPF: {8EC18CE2-D7B4-11D2-88C8-006008A717FD} (NCSView Class) - http://ww3.atlanteitaliano.it/ecwplugins/ncs.cab
O16 - DPF: {CC05BC12-2AA2-4AC7-AC81-0E40F83B1ADF} (Live365Player Class) - http://www.live365.com/players/play365.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{6A3D606A-25DE-4AE8-AFFD-2FBD37781A9A}: NameServer = 62.211.69.150 212.48.4.15
O17 - HKLM\System\CS1\Services\Tcpip\..\{6A3D606A-25DE-4AE8-AFFD-2FBD37781A9A}: NameServer = 62.211.69.150 212.48.4.15
O17 - HKLM\System\CS2\Services\Tcpip\..\{6A3D606A-25DE-4AE8-AFFD-2FBD37781A9A}: NameServer = 62.211.69.150 212.48.4.15
O23 - Service: avast! iAVS4 Control Service - Unknown - C:\Programmi\Alwil Software\Avast4ANTIVIRUS\aswUpdSv.exe
O23 - Service: avast! Antivirus - Unknown - C:\Programmi\Alwil Software\Avast4ANTIVIRUS\ashServ.exe
O23 - Service: avast! Mail Scanner - ALWIL Software - C:\Programmi\Alwil Software\Avast4ANTIVIRUS\ashMaiSv.exe
O23 - Service: Cryptainer service - Unknown - ssoftsrv.exe (file missing)
O23 - Service: Network Security Service - Unknown - C:\WINDOWS\system32\appjj.exe (file missing)

Ciao ,
esegui queste operazioni

1) Disattiva il ripristino di configurazione, leggi qui come fare
http://www.aiutamici.com/software/view.asp?tipo=home&CodSw=257&SH=N

2) 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).

==================================
O16 - DPF: {4D7F48C0-CB49-4EA6-97D4-04F4EACC2F3B} - http://sib1.od2.com/common/Member/ClientInstall/10.01.0004/OCI/setup.exe
-
O23 - Service: Cryptainer service - Unknown - ssoftsrv.exe (file missing)
O23 - Service: Network Security Service - Unknown - C:\WINDOWS\system32\appjj.exe (file missing)
==================================

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

quindi riavvia il computer e controlla se il problema e risolto, se e tutto OK riattiva il ripristino configurazione disattivato all'inizio di questa procedura.

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Collaboratore Aiutamici