Ciao Alfonso,
mi controlleresti gentilmente questi log?

Logfile of HijackThis v1.98.2
Scan saved at 10.08.19, on 20/04/2005
Platform: Windows 2000 SP3 (WinNT 5.00.2195)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)

Running processes:
C:\WINNT\System32\smss.exe
C:\WINNT\system32\csrss.exe
C:\WINNT\system32\winlogon.exe
C:\WINNT\system32\services.exe
C:\WINNT\system32\lsass.exe
C:\WINNT\system32\svchost.exe
C:\Programmi\File comuni\Symantec Shared\SNDSrvc.exe
C:\Programmi\File comuni\Symantec Shared\SPBBC\SPBBCSvc.exe
C:\Programmi\File comuni\Symantec Shared\ccSetMgr.exe
C:\Programmi\File comuni\Symantec Shared\ccEvtMgr.exe
C:\WINNT\system32\spoolsv.exe
C:\WINNT\System32\svchost.exe
C:\Programmi\Norton AntiVirus\navapsvc.exe
C:\Programmi\Norton AntiVirus\IWP\NPFMntor.exe
C:\WINNT\System32\nvsvc32.exe
C:\WINNT\system32\regsvc.exe
C:\WINNT\system32\MSTask.exe
C:\Programmi\File comuni\Symantec Shared\CCPD-LC\symlcsvc.exe
C:\WINNT\system32\ZoneLabs\vsmon.exe
C:\WINNT\System32\WBEM\WinMgmt.exe
C:\WINNT\system32\svchost.exe
C:\WINNT\Explorer.EXE
C:\WINNT\System32\GSICON.EXE
C:\WINNT\System32\dslagent.exe
C:\Programmi\Zone Labs\ZoneAlarm\zlclient.exe
C:\Programmi\File comuni\Symantec Shared\ccApp.exe
C:\WINNT\System32\internat.exe
C:\WINNT\System32\RUNDLL32.EXE
C:\Programmi\Internet Explorer\IEXPLORE.EXE
C:\WINNT\system32\NOTEPAD.EXE
C:\Programmi\Windows Media Player\wmplayer.exe
C:\WINNT\System32\dmsadmins.exe
C:\WINNT\System32\qwinnta.exe
C:\WINNT\System32\sesmgr.exe
C:\Programmi\WinMX\WinMX.exe
C:\Documents and Settings\Maxsy20051\Documenti\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.it/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\programmi\google\googletoolbar2.dll
O2 - BHO: NAV Helper - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Programmi\Norton AntiVirus\NavShExt.dll
O2 - BHO: IE SP2 AddOn - {E92C8734-17A4-47F8-BF65-B3B7B3FBBA01} - C:\WINNT\System32\spzwk.dll
O3 - Toolbar: @msdxmLC.dll,-1@1040,&Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINNT\System32\msdxm.ocx
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - C:\Programmi\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\programmi\google\googletoolbar2.dll
O3 - Toolbar: SearchToolbar - {08BEC6AA-49FC-4379-3587-4B21E286C19E} - C:\WINNT\System32\ie2cltr.dll
O4 - HKLM\..\Run: [Synchronization Manager] mobsync.exe /logon
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINNT\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [GSICONEXE] GSICON.EXE
O4 - HKLM\..\Run: [DSLAGENTEXE] dslagent.exe USB
O4 - HKLM\..\Run: [Zone Labs Client] "C:\Programmi\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKLM\..\Run: [ccApp] "C:\Programmi\File comuni\Symantec Shared\ccApp.exe"
O4 - HKLM\..\Run: [SSC_UserPrompt] C:\Programmi\File comuni\Symantec Shared\Security Center\UsrPrmpt.exe
O4 - HKLM\..\Run: [Symantec NetDriver Monitor] C:\PROGRA~1\SYMNET~1\SNDMon.exe
O4 - HKCU\..\Run: [internat.exe] internat.exe
O4 - HKCU\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINNT\System32\NVMCTRAY.DLL,NvTaskbarInit
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel present
O8 - Extra context menu item: &Google Search - res://c:\programmi\google\GoogleToolbar2.dll/cmsearch.html
O8 - Extra context menu item: Backward Links - res://c:\programmi\google\GoogleToolbar2.dll/cmbacklinks.html
O8 - Extra context menu item: Cached Snapshot of Page - res://c:\programmi\google\GoogleToolbar2.dll/cmcache.html
O8 - Extra context menu item: Similar Pages - res://c:\programmi\google\GoogleToolbar2.dll/cmsimilar.html
O8 - Extra context menu item: Translate into English - res://c:\programmi\google\GoogleToolbar2.dll/cmtrans.html
O9 - Extra button: Related - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINNT\web\related.htm
O9 - Extra 'Tools' menuitem: Show &Related Links - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINNT\web\related.htm
O15 - Trusted Zone: http://*.63.219.181.7
O16 - DPF: {02C20140-76F8-4763-83D5-B660107B7A90} (Moniker32 Class) - http://63.219.181.7/cax.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{31342AA4-73CF-4D5F-86C9-84A3961DF583}: NameServer = 69.50.176.156 195.225.176.31
O17 - HKLM\System\CCS\Services\Tcpip\..\{ED90E804-1980-4DFC-9E2B-BFE0C8C12B28}: NameServer = 69.50.176.156,195.225.176.31
O17 - HKLM\System\CS1\Services\Tcpip\..\{31342AA4-73CF-4D5F-86C9-84A3961DF583}: NameServer = 69.50.176.156 195.225.176.31

Grazie

MadMassy

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).

==================================
O2 - BHO: IE SP2 AddOn - {E92C8734-17A4-47F8-BF65-B3B7B3FBBA01} - C:\WINNT\System32\spzwk.dll
-
O3 - Toolbar: SearchToolbar - {08BEC6AA-49FC-4379-3587-4B21E286C19E} - C:\WINNT\System32\ie2cltr.dll
-
O15 - Trusted Zone: http://*.63.219.181.7
O16 - DPF: {02C20140-76F8-4763-83D5-B660107B7A90} (Moniker32 Class) - http://63.219.181.7/cax.cab
==================================

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

==================================
spzwk.dll
ie2cltr.dll
==================================

Vai a pannello di controllo e clicca su Opzioni Internet
qui clicca i tre pulsanti
ELIMINA COOKIE - ELIMINA FILE - CANCELLA CRONOLOGIA


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