Mi controllate il seguente log, grazie 1000.
Teddy.

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 16.31.25, on 05/02/2012
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:\Programmi\Bitdefender\Bitdefender 2012\vsserv.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Google\Update\GoogleUpdate.exe
C:\Programmi\Bitdefender\Bitdefender 2012\bdagent.exe
C:\WINDOWS\sm56hlpr.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Bitdefender\Bitdefender SafeBox\safeboxservice.exe
C:\Programmi\Hewlett-Packard\Digital Imaging\bin\hpotdd01.exe
C:\WINDOWS\system32\svchost.exe
C:\Documents and Settings\Utente\Impostazioni locali\Apps\2.0\61A2RYJG.JBT\H4NT2EJ6.RQW\plumb.app_8d092e02721c9040_0001.0000_d18604039688d954\Plumb.exe
C:\Programmi\TuneUp Utilities 2012\TuneUpUtilitiesService32.exe
C:\Programmi\Bitdefender\Bitdefender 2012\updatesrv.exe
C:\Programmi\TuneUp Utilities 2012\TuneUpUtilitiesApp32.exe
C:\WINDOWS\System32\svchost.exe
C:\Documents and Settings\All Users\Documenti\AppData\PoApp\PService.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Programmi\Mozilla Firefox\plugin-container.exe
C:\Programmi\Internet Explorer\IEXPLORE.EXE
C:\Programmi\Internet Explorer\IEXPLORE.EXE
C:\Programmi\Internet Explorer\IEXPLORE.EXE
C:\Programmi\Internet Explorer\IEXPLORE.EXE
C:\Documents and Settings\Utente\Desktop\SERGIO\manutenzione\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://it.msn.com/
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 = about:blank
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.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: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.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: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Programmi\Java\jre6\bin\jp2ssv.dll
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - C:\Programmi\Java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
O3 - Toolbar: (no name) - {381FFDE8-2394-4F90-B10D-FC6124A40F8C} - (no file)
O4 - HKLM\..\Run: [SpeedTouch USB Diagnostics] "C:\Programmi\Thomson\SpeedTouch USB\Dragdiag.exe" /icon
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\File comuni\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [BDAgent] "C:\Programmi\Bitdefender\Bitdefender 2012\bdagent.exe"
O4 - HKLM\..\Run: [SMSERIAL] sm56hlpr.exe
O4 - HKLM\..\Run: [Adobe ARM] "C:\Programmi\File comuni\Adobe\ARM\1.0\AdobeARM.exe"
O4 - HKLM\..\Run: [PosService] C:\Documents and Settings\All Users\Documenti\AppData\PoApp\PLauncher.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [Plumb] C:\Documents and Settings\Utente\Menu Avvio\Programmi\Palatial Software\Plumb.appref-ms
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\..\RunOnce: [_nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-18\..\RunOnce: [_nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\RunOnce: [_nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'Default user')
O4 - Global Startup: hpoddt01.exe.lnk = ?
O8 - Extra context menu item: Add to Google Photos Screensa&ver - res://C:\WINDOWS\system32\GPhotos.scr/200
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~4\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~4\OFFICE11\REFIEBAR.DLL
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search & Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.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
O15 - Trusted IP range: http://192.168.0.1
O15 - ESC Trusted IP range: http://192.168.0.1
O22 - SharedTaskScheduler: Precaricatore Browseui - {438755C2-A8BA-11D1-B96B-00A0C90312E1} - C:\WINDOWS\system32\browseui.dll
O22 - SharedTaskScheduler: Daemon di cache delle categorie di componenti - {8C7461EF-2B13-11d2-BE35-3078302C2030} - C:\WINDOWS\system32\browseui.dll
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: Servizio di Google Update (gupdate) (gupdate) - Google Inc. - C:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: Servizio Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Programmi\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\system32\HPZipm12.exe
O23 - Service: SafeBox - Bitdefender - C:\Programmi\Bitdefender\Bitdefender SafeBox\safeboxservice.exe
O23 - Service: TuneUp Utilities Service (TuneUp.UtilitiesSvc) - TuneUp Software - C:\Programmi\TuneUp Utilities 2012\TuneUpUtilitiesService32.exe
O23 - Service: BitDefender Update Server v2 (Update Server) - BitDefender - C:\Programmi\File comuni\BitDefender\BitDefender Arrakis Server\bin\arrakis3.exe
O23 - Service: BitDefender Desktop Update Service (UPDATESRV) - Bitdefender - C:\Programmi\Bitdefender\Bitdefender 2012\updatesrv.exe
O23 - Service: BitDefender Virus Shield (VSSERV) - Bitdefender - C:\Programmi\Bitdefender\Bitdefender 2012\vsserv.exe

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End of file - 7889 bytes

Prima di tutto elimina la cartella in rosso nel percorso indicato, in modalità provvisoria

C:\Documents and Settings\Utente\Impostazioni locali\Apps\2.0\61A2RYJG.JBT\H4NT2EJ6.RQW\plumb.app_8d092e02721c9040_0001.0000_d18604039688d954\Plumb.exe


Se non utili un Firewall ti consiglio di installare Outpost


da Hijack elimina questa riga

O4 - HKCU\..\Run: [Plumb] C:\Documents and Settings\Utente\Menu Avvio\Programmi\Palatial Software\Plumb.appref-ms


fai una scansione con Spybot e MalwareBytes.

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alfonso_aiutamici@hotmail.it

Grazie per la vostra rapidissima risposta.
Ho seguito le vostre preziose istruzioni ed ora sembra tutto ok.
Ciao e grazie ancora.

risolto