Aprendo l'explorer mi appare una finestra di casino ecc. chiamata "lop.com" ecco il log:
Logfile of HijackThis v1.99.1
Scan saved at 11.50.38, on 27/04/2005
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:\Programmi\Sygate\SPF\smc.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
C:\Programmi\Alwil Software\Avast4\ashServ.exe
C:\Programmi\Ahead\InCD\InCDsrv.exe
C:\WINDOWS\system32\slserv.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Java\j2re1.4.2_02\bin\jusched.exe
C:\WINDOWS\System32\hkcmd.exe
C:\Programmi\Ahead\InCD\InCD.exe
C:\Programmi\QuickTime\qttask.exe
C:\Programmi\MSN Apps\Updater\01.02.3000.1001\it\msnappau.exe
C:\Programmi\HP\hpcoretech\hpcmpmgr.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Programmi\MessengerPlus! 3\MsgPlus.exe
C:\Programmi\HP\HP Software Update\HPWuSchd2.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Spybot - Search and Destroy\TeaTimer.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\HP\Digital Imaging\bin\hpqtra08.exe
C:\Programmi\InterVideo\Common\Bin\WinCinemaMgr.exe
C:\Programmi\WIND GPRS Modem\GprsUtil.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Documents and Settings\Simone\Desktop\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {19AD8203-1538-43a0-848B-D136782E09DE} - (no file)
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: (no name) - {82315A18-6CFB-44a7-BDFD-90E36537C252} - (no file)
O2 - BHO: (no name) - {9394EDE7-C8B5-483E-8773-474BF36AF6E4} - (no file)
O2 - BHO: MSNToolBandBHO - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Programmi\MSN Apps\MSN Toolbar\01.02.4000.1001\it\msntb.dll
O2 - BHO: (no name) - {C212757C-40A6-3DCA-61F0-5DA8BD5B6249} - (no file)
O3 - Toolbar: MSN - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Programmi\MSN Apps\MSN Toolbar\01.02.4000.1001\it\msntb.dll
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Programmi\Java\j2re1.4.2_02\bin\jusched.exe
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\System32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\System32\hkcmd.exe
O4 - HKLM\..\Run: [SmcService] C:\PROGRA~1\Sygate\SPF\smc.exe -startgui
O4 - HKLM\..\Run: [InCD] C:\Programmi\Ahead\InCD\InCD.exe
O4 - HKLM\..\Run: [NeroCheck] C:\WINDOWS\system32\\NeroCheck.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [msnappau] "C:\Programmi\MSN Apps\Updater\01.02.3000.1001\it\msnappau.exe"
O4 - HKLM\..\Run: [HP Component Manager] "C:\Programmi\HP\hpcoretech\hpcmpmgr.exe"
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [UserFaultCheck] :systemroot:\system32\dumprep 0 -u
O4 - HKLM\..\Run: [MessengerPlus3] "C:\Programmi\MessengerPlus! 3\MsgPlus.exe"
O4 - HKLM\..\Run: [HP Software Update] C:\Programmi\HP\HP Software Update\HPWuSchd2.exe
O4 - HKLM\..\Run: [1 Idle Spam Axis] C:\Documents and Settings\All Users\Dati applicazioni\Deaf Bags 1 Idle\audio hope.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [apod] C:\PROGRA~1\APOD\apod.exe
O4 - HKCU\..\Run: [SpybotSD TeaTimer] C:\Programmi\Spybot - Search and Destroy\TeaTimer.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [msnmsgr] "C:\Programmi\MSN Messenger\msnmsgr.exe" /background
O4 - Global Startup: Avvio veloce di Adobe Reader.lnk = C:\Programmi\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: HP Digital Imaging Monitor.lnk = C:\Programmi\HP\Digital Imaging\bin\hpqtra08.exe
O4 - Global Startup: Intellisync Lite for NEC 616.lnk = ?
O4 - Global Startup: InterVideo WinCinema Manager.lnk = C:\Programmi\InterVideo\Common\Bin\WinCinemaMgr.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office\OSA9.EXE
O8 - Extra context menu item: Download with Go!Zilla - file://C:\Programmi\Go!Zilla\download-with-gozilla.html
O8 - Extra context menu item: Scarica con Download &Express - C:\Programmi\Download Express\Add_Url.htm
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.5.0_02\bin\npjpi150_02.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.5.0_02\bin\npjpi150_02.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: {11260943-421B-11D0-8EAC-0000C07D88CF} -
O16 - DPF: {31B7EB4E-8B4B-11D1-A789-00A0CC6651A8} (Cult3D ActiveX Player) - http://www.cult3d.com/download/cult.cab
O16 - DPF: {644E432F-49D3-41A1-8DD5-E099162EEEC5} (Symantec RuFSI Utility Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab
O16 - DPF: {8E0D4DE5-3180-4024-A327-4DFAD1796A8D} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsClient.cab31267.cab
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://www.pandasoftware.com/activescan/as5/asinst.cab
O16 - DPF: {F6BF0D00-0B2A-4A75-BF7B-F385591623AF} (Solitaire Showdown Class) - http://messenger.zone.msn.com/binary/SolitaireShowdown.cab31267.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{74D5F103-8B97-40B7-A520-3B1E4BD5600D}: NameServer = 212.245.255.2 212.141.84.12
O20 - AppInit_DLLs: MsgPlusLoader.dll
O20 - Winlogon Notify: igfxcui - C:\WINDOWS\SYSTEM32\igfxsrvc.dll
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - Unknown owner - C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - Unknown owner - C:\Programmi\Alwil Software\Avast4\ashServ.exe
O23 - Service: InCD File System Service (InCDsrv) - AHEAD Software - C:\Programmi\Ahead\InCD\InCDsrv.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\System32\HPZipm12.exe
O23 - Service: SmartLinkService (SLService) - - C:\WINDOWS\SYSTEM32\slserv.exe
O23 - Service: Sygate Personal Firewall (SmcService) - Sygate Technologies, Inc. - C:\Programmi\Sygate\SPF\smc.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).

==================================
O2 - BHO: (no name) - {19AD8203-1538-43a0-848B-D136782E09DE} - (no file)
-
O2 - BHO: (no name) - {82315A18-6CFB-44a7-BDFD-90E36537C252} - (no file)
O2 - BHO: (no name) - {9394EDE7-C8B5-483E-8773-474BF36AF6E4} - (no file)
-
O2 - BHO: (no name) - {C212757C-40A6-3DCA-61F0-5DA8BD5B6249} - (no file)
-
O4 - HKLM\..\Run: [1 Idle Spam Axis] C:\Documents and Settings\All Users\Dati applicazioni\Deaf Bags 1 Idle\audio hope.exe
-
O4 - HKCU\..\Run: [apod] C:\PROGRA~1\APOD\apod.exe
-
O16 - DPF: {11260943-421B-11D0-8EAC-0000C07D88CF} -
O16 - DPF: {31B7EB4E-8B4B-11D1-A789-00A0CC6651A8} (Cult3D ActiveX Player) - http://www.cult3d.com/download/cult.cab
==================================

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

==================================
audio hope.exe
apod.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
clicca inoltre sul pulsante PAGINA PREDEFINITA e poi 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.

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Collaboratore Aiutamici