Grazie Alfonso, purtroppo si verifica la stessa cosa sia utilizzando come browser per il download Mozilla Firefox che Internet Esplorer,attendo un tuo suggerimento,saluti e grazie

Alfonso,potresti indicarmi un programma a file ZIP per fare una prova,non mi ricordo se lo stesso problema si evidenzia anche con questi,grazie per la pazienza.

Alfonso,il programma si scarica e si apre normalmente sia con Mozilla che con Explorer,questo ti suggerisce qualche soluzione?

Ecco il mio Hijack:
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 11.01.02, on 20/08/2010
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
Boot mode: Normal

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:\Programmi\Microsoft Security Essentials\MsMpEng.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\File comuni\Apple\Mobile Device Support\AppleMobileDeviceService.exe
C:\Programmi\Bonjour\mDNSResponder.exe
C:\Programmi\Canon\IJPLM\IJPLMSVC.EXE
C:\Programmi\IObit\IObit Security 360\IS360srv.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\Nitro PDF\Reader\NitroPDFReaderDriverService.exe
C:\Programmi\File comuni\NMSAccessU.exe
C:\Programmi\Norton Ghost\Agent\VProSvc.exe
C:\Programmi\Microsoft\Search Enhancement Pack\SeaPort\SeaPort.exe
C:\Programmi\SPAMfighter\sfus.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\dllhost.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\System32\TUProgSt.exe
C:\WINDOWS\system32\wuauclt.exe
C:\WINDOWS\system32\dllhost.exe
C:\WINDOWS\system32\wbem\wmiapsrv.exe
C:\Programmi\Norton Ghost\Agent\VProTray.exe
C:\Programmi\SPAMfighter\SFAgent.exe
C:\Programmi\Microsoft Security Essentials\msseces.exe
C:\Acer\Empowering Technology\ePower\ePower_DMC.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Norton Ghost\Shared\Drivers\SymSnapService.exe
C:\Programmi\McAfee Security Scan\2.0.181\SSScheduler.exe
C:\WINDOWS\system32\msiexec.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\WINDOWS\system32\wbem\unsecapp.exe
C:\Programmi\Trend Micro\HijackThis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://it.msn.com/
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://g.msn.com/0SEENUS/SAOS01?FORM=TOOLBR
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.virgilio.it/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://g.msn.com/0SEENUS/SAOS01?FORM=TOOLBR
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = localhost;*.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Programmi\File comuni\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: RealPlayer Download and Record Plugin for Internet Explorer - {3049C3E9-B461-4BC5-8870-4C09146192CA} - C:\Documents and Settings\All Users\Dati applicazioni\Real\RealPlayer\BrowserRecordPlugin\IE\rpbrowserrecordplugin.dll
O2 - BHO: Search Helper - {6EBF7485-159F-4bff-A14F-B9E3AAC4465B} - C:\Programmi\Microsoft\Search Enhancement Pack\Search Helper\SEPsearchhelperie.dll
O2 - BHO: Guida per l'accesso a Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Programmi\File comuni\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Programmi\Google\GoogleToolbarNotifier\5.0.926.3450\swg.dll
O2 - BHO: NitroPDFBHO Class - {CF070CB8-F02F-4af4-A7B7-8D45CAD4BB54} - C:\Programmi\Nitro PDF\PDF Download\NitroPDF.dll
O2 - BHO: MSN Toolbar Helper - {d2ce3e00-f94a-4740-988e-03dc2f38c34f} - C:\Programmi\MSN\Toolbar\3.0.1203.0\msneshellx.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Programmi\Java\jre6\bin\jp2ssv.dll
O2 - BHO: Windows Live Toolbar Helper - {E15A8DC0-8516-42A1-81EA-DC94EC1ACF10} - C:\Programmi\Windows Live\Toolbar\wltcore.dll
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - C:\Programmi\Java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
O3 - Toolbar: &Windows Live Toolbar - {21FA44EF-376D-4D53-9B0F-8A89D3229068} - C:\Programmi\Windows Live\Toolbar\wltcore.dll
O3 - Toolbar: (no name) - {327C2873-E90D-4c37-AA9D-10AC9BABA46C} - (no file)
O3 - Toolbar: MSN Toolbar - {1E61ED7C-7CB8-49d6-B9E9-AB4C880C8414} - C:\Programmi\MSN\Toolbar\3.0.1203.0\msneshellx.dll
O4 - HKLM\..\Run: [Norton Ghost 14.0] "C:\Programmi\Norton Ghost\Agent\VProTray.exe"
O4 - HKLM\..\Run: [SPAMfighter Agent] "C:\Programmi\SPAMfighter\SFAgent.exe" update delay 60
O4 - HKLM\..\Run: [MSSE] "c:\Programmi\Microsoft Security Essentials\msseces.exe" -hide -runkey
O4 - HKLM\..\Run: [ePower_DMC] C:\Acer\Empowering Technology\ePower\ePower_DMC.exe
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-19\..\RunOnce: [nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-20\..\RunOnce: [nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\S-1-5-18\..\RunOnce: [nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - HKUS\.DEFAULT\..\RunOnce: [nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'Default user')
O4 - Global Startup: McAfee Security Scan Plus.lnk = ?
O8 - Extra context menu item: Add to Windows &Live Favorites - http://favorites.live.com/quickadd.aspx
O8 - Extra context menu item: Aggiungi all'elenco di stampa Easy-WebPrint - res://C:\Programmi\Canon\Easy-WebPrint\Resource.dll/RC_AddToList.html
O8 - Extra context menu item: Anteprima Easy-WebPrint - res://C:\Programmi\Canon\Easy-WebPrint\Resource.dll/RC_Preview.html
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: Save Page As PDF ... - file://C:\Programmi\Nitro PDF\PDF Download\nitroweb.htm
O8 - Extra context menu item: Stampa ad alta velocità Easy-WebPrint - res://C:\Programmi\Canon\Easy-WebPrint\Resource.dll/RC_HSPrint.html
O8 - Extra context menu item: Stampa Easy-WebPrint - res://C:\Programmi\Canon\Easy-WebPrint\Resource.dll/RC_Print.html
O9 - Extra button: (no name) - {AD9E6088-E00B-42f9-9F0C-8480525D234E} - C:\Programmi\Nitro PDF\PDF Download\NitroPDF.dll
O9 - Extra 'Tools' menuitem: PDF Download - Options - {AD9E6088-E00B-42f9-9F0C-8480525D234E} - C:\Programmi\Nitro PDF\PDF Download\NitroPDF.dll
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
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
O9 - Extra button: PDF Download - {F1C0FD6C-A6A0-49a7-A932-71A56461867F} - C:\Programmi\Nitro PDF\PDF Download\NitroPDF.dll (HKCU)
O15 - Trusted Zone: http://www.crs.regione.lombardia.it
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FILECO~1\Skype\Skype4COM.dll
O23 - Service: 3Wh8DZ - CPUID - C:\Programmi\CPUID\PC Wizard 2010\Data\pcwizntl.exe
O23 - Service: 6Mpk3t - CPUID - C:\Programmi\CPUID\PC Wizard 2010\Data\pcwizntl.exe
O23 - Service: 9jRLQE - CPUID - C:\Programmi\CPUID\PC Wizard 2010\Data\pcwizntl.exe
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Programmi\File comuni\Apple\Mobile Device Support\AppleMobileDeviceService.exe
O23 - Service: Servizio Bonjour (Bonjour Service) - Apple Inc. - C:\Programmi\Bonjour\mDNSResponder.exe
O23 - Service: D5ZwmZ - CPUID - C:\Programmi\CPUID\PC Wizard 2010\Data\pcwizntl.exe
O23 - Service: Servizio di Google Update (gupdate1c9b6d6874e7ab6) (gupdate1c9b6d6874e7ab6) - Google Inc. - C:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: Google Software Updater (gusvc) - Google - C:\Programmi\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: GwC4dt - CPUID - C:\Programmi\CPUID\PC Wizard 2010\Data\pcwizntl.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: Inkjet Printer/Scanner Extended Survey Program (IJPLMSVC) - Unknown owner - C:\Programmi\Canon\IJPLM\IJPLMSVC.EXE
O23 - Service: Servizio iPod (iPod Service) - Apple Inc. - C:\Programmi\iPod\bin\iPodService.exe
O23 - Service: IS360service - IObit - C:\Programmi\IObit\IObit Security 360\IS360srv.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: JIKf0E - CPUID - C:\Programmi\CPUID\PC Wizard 2010\Data\pcwizntl.exe
O23 - Service: LiveUpdate - Symantec Corporation - C:\PROGRA~1\Symantec\LiveUpdate\LuComServer_3_2.EXE
O23 - Service: McAfee Security Scan Component Host Service (McComponentHostService) - McAfee, Inc. - C:\Programmi\McAfee Security Scan\2.0.181\McCHSvc.exe
O23 - Service: NitroPDFReaderDriverCreatorReadSpool (NitroReaderDriverReadSpool) - Nitro PDF Software - C:\Programmi\Nitro PDF\Reader\NitroPDFReaderDriverService.exe
O23 - Service: NMSAccessU - Unknown owner - C:\Programmi\File comuni\NMSAccessU.exe
O23 - Service: Norton Ghost - Symantec Corporation - C:\Programmi\Norton Ghost\Agent\VProSvc.exe
O23 - Service: SPAMfighter Update Service - SPAMfighter ApS - C:\Programmi\SPAMfighter\sfus.exe
O23 - Service: Symantec Core LC - Unknown owner - C:\PROGRA~1\FILECO~1\Symantec Shared\CCPD-LC\symlcsvc.exe
O23 - Service: SymSnapService - Symantec - C:\Programmi\Norton Ghost\Shared\Drivers\SymSnapService.exe
O23 - Service: TuneUp Drive Defrag Service (TuneUp.Defrag) - TuneUp Software - C:\WINDOWS\System32\TuneUpDefragService.exe
O23 - Service: TuneUp Program Statistics Service (TuneUp.ProgramStatisticsSvc) - TuneUp Software - C:\WINDOWS\System32\TUProgSt.exe
O23 - Service: z951qE - CPUID - C:\Programmi\CPUID\PC Wizard 2010\Data\pcwizntl.exe

--
End of file - 10935 bytes

Alfonso,ho fatto come suggerito,vedrò in seguito se ci sono variazioni,dal pannello di controllo,non sono riuscito a disinstallare completamente McAfee,mi si dice cjìhe cè stato un errore nella disinstallazione,mi si dice che devo avvertire l'amministratore di sistema in quanto io non avrei i requisiti,ma io sono l'amministratore.