Alfonso, grazie per la tua solerzia, come mi hai consiliato sul Forum "Problemi informatici"
ti allego il LOG.
Ti ringrazio anticipatamente per quanto potrai fare, Saluti
Logfile of HijackThis v1.99.1
Scan saved at 23.36.45, on 08/02/2006
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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
C:\Programmi\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\System32\cisvc.exe
C:\WINDOWS\System32\CTSVCCDA.EXE
C:\Programmi\Dantz\Retrospect\retrorun.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Alwil Software\Avast4\ashDisp.exe
C:\Programmi\FreeSoft\Uranium\Uranium.exe
C:\Programmi\ARESCOM\Modem Telindus Arescom ND220\dslmon.exe
C:\Programmi\Sinapsi Antispam\SinapsiAntispam.exe
C:\Programmi\Panicware\Pop-Up Stopper Free Edition\PSFree.exe
C:\Programmi\Zone Labs\ZoneAlarm\zlclient.exe
C:\WINDOWS\system32\ZoneLabs\vsmon.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\WINDOWS\system32\cidaemon.exe
C:\Documents and Settings\Osvaldo\Desktop\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.virgilio.it/home/index.html
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.creative.com
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.virgilio.it/home/index.html
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O4 - HKLM\..\Run: [avast!] "C:\Programmi\Alwil Software\Avast4\ashDisp.exe"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKCU\..\Run: [Uranium] C:\Programmi\FreeSoft\Uranium\Uranium.exe reg
O4 - Global Startup: DSLMON.lnk = ?
O16 - DPF: {D147430C-86CD-4E6F-A807-93FBC496D201} (NCSLayeredView Class) - http://www.cartografia.regione.lombardia.it/ecwplugins/ncs.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{328CCDCB-3148-4F2D-B0FC-459C049EB081}: NameServer = 85.37.17.7 85.38.28.95
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - "C:\PROGRA~1\MSN Messenger\msgrapp.dll" (file missing)
O20 - AppInit_DLLs: C:\WINDOWS\system32\wmfhotfix.dll
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - Unknown owner - C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.exe
O23 - Service: avast! Antivirus - Unknown owner - C:\Programmi\Alwil Software\Avast4\ashServ.exe
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\System32\CTSVCCDA.EXE
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: iPodService - Apple Computer, Inc. - C:\Programmi\iPod\bin\iPodService.exe
O23 - Service: Retrospect Launcher (RetroLauncher) - Dantz Development Corporation - C:\Programmi\Dantz\Retrospect\retrorun.exe
O23 - Service: Sandra Data Service (SandraDataSrv) - SiSoftware - F:\Papà\Programmi\SiSoftware Sandra Lite 2005.SR2a\RpcDataSrv.exe
O23 - Service: Sandra Service (SandraTheSrv) - SiSoftware - F:\Papà\Programmi\SiSoftware Sandra Lite 2005.SR2a\RpcSandraSrv.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs, LLC - C:\WINDOWS\system32\ZoneLabs\vsmon.exe

Ciao ,
esegui queste operazioni

Disinstalla prima di tutto il programma SinapsiAntispam

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

Con la funzione CERCA di Windows, cerca ed elimina questi file,
==================================
SinapsiAntispam.exe
==================================

ELIMINA LA CARTELLA IN ROSSO
==================================
C:\Programmi\Sinapsi Antispam
==================================

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

Fai una scansione con questo programma
http://www.aiutamici.com/software/view.asp?tipo=home&CodSw=1286

sempre in modalità provvisoria fai una scansione Antivirus

quindi riavvia il computer

utilizza questo programma per ripulire il file di registro
http://www.aiutamici.com/software/view.asp?tipo=home&CodSw=931

Per quanto riguarda la posta, elimina gli account e creane dei nuovi.

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Collaboratore Aiutamici