Ho seguito alla lettera i vostri consigli, ma non sono riuscito ad eliminare il problema: c'è un eseguibile (nail.exe) che non riesco ad eliminare.
Cmq quando mi collego ad internet mi si aprono subito un paio di pagine pubblicitarie (aurora; ecc.).
Vorrei evitare il "formattone.
Vi rimando cmq il Logfile dopo aver eseguito le vostre istruzioni:

Logfile of HijackThis v1.99.1
Scan saved at 13.36.23, on 09/07/2005
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\Explorer.exe
C:\Programmi\File comuni\Symantec Shared\ccSetMgr.exe
C:\Programmi\File comuni\Symantec Shared\SNDSrvc.exe
C:\Programmi\File comuni\Symantec Shared\SPBBC\SPBBCSvc.exe
C:\Programmi\File comuni\Symantec Shared\ccEvtMgr.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\CTsvcCDA.EXE
C:\Programmi\File comuni\EPSON\EBAPI\SAgent2.exe
C:\Programmi\File comuni\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\Programmi\Norton SystemWorks\Norton AntiVirus\navapsvc.exe
C:\Programmi\Norton SystemWorks\Norton AntiVirus\IWP\NPFMntor.exe
C:\PROGRA~1\NORTON~1\NORTON~1\NPROTECT.EXE
C:\WINDOWS\system32\nvsvc32.exe
C:\PROGRA~1\NORTON~1\NORTON~1\SPEEDD~1\NOPDB.EXE
C:\Programmi\File comuni\Symantec Shared\CCPD-LC\symlcsvc.exe
C:\Programmi\Creative\SB Live! 24-bit\Surround Mixer\CTSysVol.exe
C:\Programmi\CyberLink\PowerDVD\PDVDServ.exe
C:\Programmi\D-Tools\daemon.exe
C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_S10IC2.EXE
C:\Programmi\I-Storm USB ADSL Modem\CnxDslTb.exe
C:\Programmi\File comuni\Real\Update_OB\realsched.exe
C:\WINDOWS\system32\RUNDLL32.EXE
C:\Programmi\File comuni\Symantec Shared\ccApp.exe
C:\WINDOWS\system32\rundll32.exe
c:\windows\system32\vtrrlxu.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\GetRight\getright.exe
C:\Programmi\GetRight\getright.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Downloads\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.it/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
F2 - REG:system.ini: Shell=Explorer.exe C:\WINDOWS\Nail.exe
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: bho2gr Class - {31FF080D-12A3-439A-A2EF-4BA95A3148E8} - C:\Programmi\GetRight\xx2gr.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 SystemWorks\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - C:\Programmi\Norton SystemWorks\Norton AntiVirus\NavShExt.dll
O4 - HKLM\..\Run: [CTSysVol] C:\Programmi\Creative\SB Live! 24-bit\Surround Mixer\CTSysVol.exe /r
O4 - HKLM\..\Run: [UpdReg] C:\WINDOWS\UpdReg.EXE
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [RemoteControl] C:\Programmi\CyberLink\PowerDVD\PDVDServ.exe
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [DAEMON Tools-1033] "C:\Programmi\D-Tools\daemon.exe" -lang 1033
O4 - HKLM\..\Run: [EPSON Stylus C62 Series] C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_S10IC2.EXE /P23 "EPSON Stylus C62 Series" /O5 "LPT1:" /M "Stylus C62"
O4 - HKLM\..\Run: [CnxDslTaskBar] "C:\Programmi\I-Storm USB ADSL Modem\CnxDslTb.exe"
O4 - HKLM\..\Run: [TkBellExe] "C:\Programmi\File comuni\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [ccApp] "C:\Programmi\File comuni\Symantec Shared\ccApp.exe"
O4 - HKLM\..\Run: [Symantec NetDriver Monitor] C:\PROGRA~1\SYMNET~1\SNDMon.exe /Consumer
O4 - HKLM\..\Run: [slwflr] c:\windows\system32\vtrrlxu.exe r
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [Norton SystemWorks] "C:\Programmi\Norton SystemWorks\cfgwiz.exe" /GUID {05858CFD-5CC4-4ceb-AAAF-CF00BF39736A} /MODE CfgWiz
O4 - Global Startup: Adobe Reader Speed Launch.lnk = ?
O4 - Global Startup: GetRight - Tray Icon.lnk = C:\Programmi\GetRight\getright.exe
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Restrictions present
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel present
O8 - Extra context menu item: Download with GetRight - C:\Programmi\GetRight\GRdownload.htm
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O8 - Extra context menu item: Open with GetRight Browser - C:\Programmi\GetRight\GRbrowse.htm
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: (no name) - {B205A35E-1FC4-4CE3-818B-899DBBB3388C} - C:\Programmi\File comuni\Microsoft Shared\Encarta Search Bar\ENCSBAR.DLL
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: {2BC66F54-93A8-11D3-BEB6-00105AA9B6AE} (Symantec AntiVirus scanner) - http://security.symantec.com/sscv6/SharedContent/vc/bin/AvSniff.cab
O16 - DPF: {644E432F-49D3-41A1-8DD5-E099162EEEC5} (Symantec RuFSI Utility Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab
O23 - Service: Symantec Event Manager (ccEvtMgr) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\ccEvtMgr.exe
O23 - Service: Symantec Password Validation (ccPwdSvc) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\ccPwdSvc.exe
O23 - Service: Symantec Settings Manager (ccSetMgr) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\ccSetMgr.exe
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\system32\CTsvcCDA.EXE
O23 - Service: EPSON Printer Status Agent2 (EPSONStatusAgent2) - SEIKO EPSON CORPORATION - C:\Programmi\File comuni\EPSON\EBAPI\SAgent2.exe
O23 - Service: Servizio Auto-Protect di Norton AntiVirus (navapsvc) - Symantec Corporation - C:\Programmi\Norton SystemWorks\Norton AntiVirus\navapsvc.exe
O23 - Service: Norton AntiVirus Firewall Monitor Service (NPFMntor) - Symantec Corporation - C:\Programmi\Norton SystemWorks\Norton AntiVirus\IWP\NPFMntor.exe
O23 - Service: Norton Unerase Protection (NProtectService) - Symantec Corporation - C:\PROGRA~1\NORTON~1\NORTON~1\NPROTECT.EXE
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: SAVScan - Symantec Corporation - C:\Programmi\Norton SystemWorks\Norton AntiVirus\SAVScan.exe
O23 - Service: ScriptBlocking Service (SBService) - Symantec Corporation - C:\PROGRA~1\FILECO~1\SYMANT~1\SCRIPT~1\SBServ.exe
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\SNDSrvc.exe
O23 - Service: Symantec SPBBCSvc (SPBBCSvc) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\SPBBC\SPBBCSvc.exe
O23 - Service: Speed Disk service - Symantec Corporation - C:\PROGRA~1\NORTON~1\NORTON~1\SPEEDD~1\NOPDB.EXE
O23 - Service: System Startup Service (SvcProc) - Unknown owner -
C:\WINDOWS\svcproc.exe (file missing)
O23 - Service: Symantec Core LC - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\CCPD-LC\symlcsvc.exe

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).

==================================
F2 - REG:system.ini: Shell=Explorer.exe C:\WINDOWS\Nail.exe
-
O4 - HKLM\..\Run: [slwflr] c:\windows\system32\vtrrlxu.exe r
-
O23 - Service: System Startup Service (SvcProc) - Unknown owner -
C:\WINDOWS\svcproc.exe (file missing)
==================================

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

==================================
vtrrlxu.exe
Nail.exe
svcproc.exe
==================================


Vai a PANNELLO DI CONTROLLO e clicca su OPZIONI INTERNET
nella finestra che si apre clicca i tre pulsanti
ELIMINA COOKIES - ELIMINA FILE - CANCELLA CRONOOLOGIA
poi clicca il pulsante PAGINA PREDEFINITA e su OK

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

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.


Fai un controllo antivirus on line da questo indirizzo
http://security.symantec.com/default.asp?productid=symhome&langid=it&venid=sym
se vengono rilevati virus che il tuo antivirus non vede, sarà necessario formattare.

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Collaboratore Aiutamici