Ciao Alfonso,
mi controlleresti questi log per favore...

Logfile of HijackThis v1.98.2
Scan saved at 10.26.35, on 13/01/2005
Platform: Windows 2000 SP1 (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:\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\Explorer.exe
C:\WINNT\System32\WBEM\WinMgmt.exe
C:\WINNT\System32\GSICON.EXE
C:\WINNT\System32\dslagent.exe
C:\Programmi\File comuni\Symantec Shared\ccApp.exe
C:\WINNT\System32\internat.exe
C:\WINNT\System32\RUNDLL32.EXE
C:\Programmi\Zone Labs\ZoneAlarm\zonealarm.exe
C:\Programmi\DivX\DivX Player\DivX Player.exe
C:\Programmi\WinMX\WinMX.exe
C:\Programmi\Internet Explorer\IEXPLORE.EXE
D:\Appoggio\Programmi\Anti-Spyware\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = res://C:\DOCUME~1\Massy\IMPOST~1\Temp\sp.dll/sp.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = res://C:\DOCUME~1\Massy\IMPOST~1\Temp\sp.dll/sp.html
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,HomeOldSP = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,HomeOldSP = about:blank
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: (no name) - {2FC81BCD-D514-41AE-83B8-1EB6EBD89DE6} - C:\WINNT\System32\gmea.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: NAV Helper - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Programmi\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: &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
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: [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
O4 - Global Startup: ZoneAlarm.lnk = C:\Programmi\Zone Labs\ZoneAlarm\zonealarm.exe
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
O17 - HKLM\System\CCS\Services\Tcpip\..\{FBCDDE60-CAE2-4503-BDB7-33B8523B73F2}: NameServer = 62.211.69.150 212.48.4.15
O18 - Filter: text/html - {080532DF-17C6-4C1F-B05B-B4EC3C5E6E30} - C:\WINNT\System32\gmea.dll
O18 - Filter: text/plain - {080532DF-17C6-4C1F-B05B-B4EC3C5E6E30} - C:\WINNT\System32\gmea.dll

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).

==================================
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = res://C:\DOCUME~1\Massy\IMPOST~1\Temp\sp.dll/sp.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = res://C:\DOCUME~1\Massy\IMPOST~1\Temp\sp.dll/sp.html
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,HomeOldSP = about:blank
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,HomeOldSP = about:blank
-
O2 - BHO: (no name) - {2FC81BCD-D514-41AE-83B8-1EB6EBD89DE6} - C:\WINNT\System32\gmea.dll
-
O18 - Filter: text/html - {080532DF-17C6-4C1F-B05B-B4EC3C5E6E30} - C:\WINNT\System32\gmea.dll
O18 - Filter: text/plain - {080532DF-17C6-4C1F-B05B-B4EC3C5E6E30} - C:\WINNT\System32\gmea.dll
==================================

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

==================================
sp.dll
gmea.dll
==================================

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.

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Collaboratore Aiutamici