per alfonso..
mi faresti il favore di controllarmi il log di hijack this.

ti ringrazio in anticipo....

Logfile of HijackThis v1.99.0
Scan saved at 15.16.58, on 04/04/2005
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

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\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
C:\Programmi\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\System32\DRIVERS\CDANTSRV.EXE
C:\Programmi\File comuni\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\WINDOWS\System32\svchost.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Programmi\QuickTime\qttask.exe
C:\Programmi\MSN Apps\Updater\01.02.3000.1001\it\msnappau.exe
C:\WINDOWS\System32\cassl.exe
C:\Documents and Settings\Administrator\removeme.exe
C:\Program Files\Media Access\MediaAccK.exe
C:\Program Files\Media Pass\MediaPassK.exe
C:\WINDOWS\qivoniq.exe
C:\Program Files\Media Access\MediaAccess.exe
C:\Programmi\MSN Messenger\MsnMsgr.Exe
C:\WINDOWS\System32\msmq2inst.exe
C:\Program Files\Media Pass\MediaPass.exe
C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
C:\Programmi\Alwil Software\Avast4\ashWebSv.exe
C:\WINDOWS\System32\wuauclt.exe
C:\WINDOWS\System32\wuauclt.exe
C:\WINDOWS\system32\drwtsn32.exe
C:\Programmi\hijack\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.comune.forli.fo.it/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: ST - {9394EDE7-C8B5-483E-8773-474BF36AF6E4} - C:\Programmi\MSN Apps\ST\01.02.3000.1002\en-xu\stmain.dll
O2 - BHO: MSNToolBandBHO - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Programmi\MSN Apps\MSN Toolbar\01.02.4000.1001\it\msntb.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\system32\msdxm.ocx
O3 - Toolbar: MSN - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Programmi\MSN Apps\MSN Toolbar\01.02.4000.1001\it\msntb.dll
O3 - Toolbar: ISTbar - {FAA356E4-D317-42a6-AB41-A3021C6E7D52} - C:\Programmi\ISTbar\istbarcm.dll (file missing)
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [SmcService] C:\PROGRA~1\Sygate\SPF\smc.exe -startgui
O4 - HKLM\..\Run: [msnappau] "C:\Programmi\MSN Apps\Updater\01.02.3000.1001\it\msnappau.exe"
O4 - HKLM\..\Run: [winservit] cassl.exe
O4 - HKLM\..\Run: [Windows Service Pack Auto Update] C:\Documents and Settings\Administrator\removeme.exe
O4 - HKLM\..\Run: [Preview AdService] C:\Program Files\Preview AdService\PrevAdServ.exe
O4 - HKLM\..\Run: [Media Access] C:\Program Files\Media Access\MediaAccK.exe
O4 - HKLM\..\Run: [Media Pass] C:\Program Files\Media Pass\MediaPassK.exe
O4 - HKLM\..\Run: [Dynamic Dns Binary] dynitora.exe
O4 - HKLM\..\Run: [MS Unix Binary] msmq2inst.exe
O4 - HKLM\..\Run: [ctkAF] C:\WINDOWS\qivoniq.exe
O4 - HKLM\..\Run: [Security Patch] scmss.exe
O4 - HKLM\..\RunServices: [winservit] cassl.exe
O4 - HKLM\..\RunServices: [Dynamic Dns Binary] dynitora.exe
O4 - HKLM\..\RunServices: [MS Unix Binary] msmq2inst.exe
O4 - HKLM\..\RunServices: [Security Patch] scmss.exe
O4 - HKCU\..\Run: [Dynamic Dns Binary] dynitora.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Programmi\MSN Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [winservit] cassl.exe
O4 - HKCU\..\Run: [MS Unix Binary] msmq2inst.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\WINDOWS\System32\msjava.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\WINDOWS\System32\msjava.dll
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\MSMSGS.EXE
O9 - Extra 'Tools' menuitem: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\MSMSGS.EXE
O15 - Trusted Zone: http://ny.contentmatch.net (HKLM)
O16 - DPF: {15AD6789-CDB4-47E1-A9DA-992EE8E6BAD6} - http://static.windupdates.com/cab/6247971CanadaInc/ie/Bridge-c139.cab
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
O16 - DPF: {74D05D43-3236-11D4-BDCD-00C04F9A3B61} (HouseCall Control) - http://housecall.trendmicro-europe.com/housecall/Xscan53.cab
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/msnmessengersetupdownloader.cab
O16 - DPF: {D719897A-B07A-4C0C-AEA9-9B663A28DFCB} (iTunesDetector Class) - http://ax.phobos.apple.com.edgesuite.net/detection/ITDetector.cab
O23 - Service: avast! iAVS4 Control Service - Unknown - C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - Unknown - C:\Programmi\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - ALWIL Software - C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
O23 - Service: avast! Web Scanner - ALWIL Software - C:\Programmi\Alwil Software\Avast4\ashWebSv.exe
O23 - Service: C-DillaSrv - C-Dilla Ltd - C:\WINDOWS\System32\DRIVERS\CDANTSRV.EXE
O23 - Service: Sygate Personal Firewall - Sygate Technologies, Inc. - C:\Programmi\Sygate\SPF\smc.exe

grazie sergio.

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).

==================================
O3 - Toolbar: ISTbar - {FAA356E4-D317-42a6-AB41-A3021C6E7D52} - C:\Programmi\ISTbar\istbarcm.dll (file missing)
-
O4 - HKLM\..\Run: [winservit] cassl.exe
O4 - HKLM\..\Run: [Windows Service Pack Auto Update] C:\Documents and Settings\Administrator\removeme.exe
O4 - HKLM\..\Run: [Preview AdService] C:\Program Files\Preview AdService\PrevAdServ.exe
O4 - HKLM\..\Run: [Media Access] C:\Program Files\Media Access\MediaAccK.exe
O4 - HKLM\..\Run: [Media Pass] C:\Program Files\Media Pass\MediaPassK.exe
O4 - HKLM\..\Run: [Dynamic Dns Binary] dynitora.exe
O4 - HKLM\..\Run: [MS Unix Binary] msmq2inst.exe
O4 - HKLM\..\Run: [ctkAF] C:\WINDOWS\qivoniq.exe
O4 - HKLM\..\Run: [Security Patch] scmss.exe
O4 - HKLM\..\RunServices: [winservit] cassl.exe
O4 - HKLM\..\RunServices: [Dynamic Dns Binary] dynitora.exe
O4 - HKLM\..\RunServices: [MS Unix Binary] msmq2inst.exe
O4 - HKLM\..\RunServices: [Security Patch] scmss.exe
O4 - HKCU\..\Run: [Dynamic Dns Binary] dynitora.exe
-
O4 - HKCU\..\Run: [winservit] cassl.exe
O4 - HKCU\..\Run: [MS Unix Binary] msmq2inst.exe
-
O15 - Trusted Zone: http://ny.contentmatch.net (HKLM)
O16 - DPF: {15AD6789-CDB4-47E1-A9DA-992EE8E6BAD6} - http://static.windupdates.com/cab/6247971CanadaInc/ie/Bridge-c139.cab
==================================

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

==================================
istbarcm.dll
cassl.exe
removeme.exe
PrevAdServ.exe
MediaAccK.exe
MediaPassK.exe
dynitora.exe
msmq2inst.exe
qivoniq.exe
scmss.exe
==================================

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