Il fatto è che di queste cose ci capisco poco-nulla... :rollo:
Ho installato e fatto funzionare HijackThis. Provo a riportare il log (si dice "postare"?), sperando che abbiate ancora la pazienza di buttarci un occhio e dirmi se è tutto OK.
Grazie a tutti per l'aiuto

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Logfile of HijackThis v1.99.1
Scan saved at 19.53.12, on 28/08/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16512)

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\File comuni\Symantec Shared\ccSvcHst.exe
C:\Programmi\File comuni\Symantec Shared\AppCore\AppSvc32.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\TOSHIBA\ConfigFree\CFSvcs.exe
C:\Programmi\File comuni\Symantec Shared\ccSvcHst.exe
C:\WINDOWS\system32\DVDRAMSV.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\WINDOWS\system32\UStorSrv.exe
C:\Programmi\Symantec\LiveUpdate\ALUSchedulerSvc.e xe
C:\WINDOWS\system32\00THotkey.exe
C:\Programmi\SigmaTel\Driver audio di SigmaTel AC97\stacmon.exe
C:\Programmi\Synaptics\SynTP\SynTPLpr.exe
C:\Programmi\Synaptics\SynTP\SynTPEnh.exe
C:\Programmi\TOSHIBA\TouchED\TouchED.Exe
C:\Programmi\Drag'n Drop CD+DVD\BinFiles\DragDrop.exe
C:\WINDOWS\system32\ezSP_Px.exe
C:\WINDOWS\system32\TFNF5.exe
C:\Programmi\TOSHIBA\TOSHIBA Controls\TFncKy.exe
C:\WINDOWS\AGRSMMSG.exe
C:\Programmi\File comuni\Symantec Shared\ccApp.exe
C:\WINDOWS\system32\TPSBattM.exe
C:\Programmi\TOSHIBA\TOSCDSPD\toscdspd.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\File comuni\Ahead\lib\NMBgMonitor.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Adobe\AcrobatStandard6\Distillr\acrot ray.exe
C:\Programmi\Panasonic\LUMIXSimpleViewer\PhLeAutoR un.exe
C:\Programmi\Microsoft Office\Office\1040\OLFSNT40.EXE
C:\WINDOWS\system32\RAMASST.exe
C:\Programmi\Microsoft Office\OFFICE11\ONENOTEM.EXE
C:\Programmi\File comuni\Symantec Shared\CCPD-LC\symlcsvc.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\WISPTIS.EXE
C:\Programmi\Strumenti PC\Diagnostica\Sicurezza\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.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
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Int ernet Settings,ProxyServer = 192.168.0.3:3128
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\AcrobatStandard6\Acrobat\Active X\AcroIEHelper.dll
O2 - BHO: (no name) - {1E8A6170-7264-4D0F-BEAE-D42A53123C75} - C:\Programmi\File comuni\Symantec Shared\coShared\Browser\1.5\NppBho.dll
O2 - BHO: AcroIEToolbarHelper Class - {AE7CD045-E861-484f-8273-0445EE161910} - C:\Programmi\Adobe\AcrobatStandard6\Acrobat\AcroIE FavClient.dll
O3 - Toolbar: Adobe PDF - {47833539-D0C5-4125-9FA8-0819E2EAAC93} - C:\Programmi\Adobe\AcrobatStandard6\Acrobat\AcroIE FavClient.dll
O3 - Toolbar: Show Norton Toolbar - {90222687-F593-4738-B738-FBEE9C7B26DF} - C:\Programmi\File comuni\Symantec Shared\coShared\Browser\1.5\UIBHO.dll
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [00THotkey] C:\WINDOWS\system32\00THotkey.exe
O4 - HKLM\..\Run: [SigmaTel StacMon] C:\Programmi\SigmaTel\Driver audio di SigmaTel AC97\stacmon.exe
O4 - HKLM\..\Run: [SynTPLpr] C:\Programmi\Synaptics\SynTP\SynTPLpr.exe
O4 - HKLM\..\Run: [SynTPEnh] C:\Programmi\Synaptics\SynTP\SynTPEnh.exe
O4 - HKLM\..\Run: [TouchED] C:\Programmi\TOSHIBA\TouchED\TouchED.Exe
O4 - HKLM\..\Run: [TPSMain] TPSMain.exe
O4 - HKLM\..\Run: [Drag'n Drop CD+DVD] C:\Programmi\Drag'n Drop CD+DVD\BinFiles\DragDrop.exe /StartUp
O4 - HKLM\..\Run: [ezShieldProtector for Px] C:\WINDOWS\system32\ezSP_Px.exe
O4 - HKLM\..\Run: [TFNF5] TFNF5.exe
O4 - HKLM\..\Run: [TFncKy] TFncKy.exe
O4 - HKLM\..\Run: [nwiz] nwiz.exe /installquiet
O4 - HKLM\..\Run: [AGRSMMSG] AGRSMMSG.exe
O4 - HKLM\..\Run: [000StTHK] 000StTHK.exe
O4 - HKLM\..\Run: [UserFaultCheck] %systemroot%\system32\dumprep 0 -u
O4 - HKLM\..\Run: [Adobe Photo Downloader] "C:\Programmi\Adobe\3.0\Apps\apdproxy.exe"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [ccApp] "C:\Programmi\File comuni\Symantec Shared\ccApp.exe"
O4 - HKLM\..\Run: [osCheck] "C:\Programmi\Norton Internet Security\osCheck.exe"
O4 - HKLM\..\Run: [Symantec PIF AlertEng] "C:\Programmi\File comuni\Symantec Shared\PIF\{B8E1DD85-8582-4c61-B58F-2F227FCA9A08}\PIFSvc.exe" /a /m "C:\Programmi\File comuni\Symantec Shared\PIF\{B8E1DD85-8582-4c61-B58F-2F227FCA9A08}\AlertEng.dll"
O4 - HKCU\..\Run: [TOSCDSPD] C:\Programmi\TOSHIBA\TOSCDSPD\toscdspd.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [BgMonitor_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "C:\Programmi\File comuni\Ahead\lib\NMBgMonitor.exe"
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - Startup: Microsoft Office OneNote 2003 Quick Launch.lnk = C:\Programmi\Microsoft Office\OFFICE11\ONENOTEM.EXE
O4 - Global Startup: Acrobat Assistant.lnk = C:\Programmi\Adobe\AcrobatStandard6\Distillr\acrot ray.exe
O4 - Global Startup: Avvio veloce di Adobe Reader.lnk = C:\Programmi\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: LUMIX Simple Viewer.lnk = ?
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office\OSA9.EXE
O4 - Global Startup: Porta Symantec Fax Starter Edition.lnk = C:\Programmi\Microsoft Office\Office\1040\OLFSNT40.EXE
O4 - Global Startup: RAMASST.lnk = C:\WINDOWS\system32\RAMASST.exe
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\j2re1.4.2_05\bin\npjpi142_05.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\j2re1.4.2_05\bin\npjpi142_05.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: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O11 - Options group: [INTERNATIONAL] International*
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O23 - Service: Symantec Event Manager (ccEvtMgr) - Unknown owner - C:\Programmi\File comuni\Symantec Shared\ccSvcHst.exe" /h ccCommon (file missing)
O23 - Service: Symantec Settings Manager (ccSetMgr) - Unknown owner - C:\Programmi\File comuni\Symantec Shared\ccSvcHst.exe" /h ccCommon (file missing)
O23 - Service: ConfigFree Service (CFSvcs) - TOSHIBA CORPORATION - C:\Programmi\TOSHIBA\ConfigFree\CFSvcs.exe
O23 - Service: Symantec Lic NetConnect service (CLTNetCnService) - Unknown owner - C:\Programmi\File comuni\Symantec Shared\ccSvcHst.exe" /h cltCommon (file missing)
O23 - Service: COM Host (comHost) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\VAScanner\comHost.exe
O23 - Service: DVD-RAM_Service - Matsushita Electric Industrial Co., Ltd. - C:\WINDOWS\system32\DVDRAMSV.exe
O23 - Service: Symantec IS Password Validation (ISPwdSvc) - Symantec Corporation - C:\Programmi\Norton Internet Security\isPwdSvc.exe
O23 - Service: LiveUpdate - Symantec Corporation - C:\PROGRA~1\Symantec\LIVEUP~1\LUCOMS~1.EXE
O23 - Service: LiveUpdate Notice Service Ex (LiveUpdate Notice Ex) - Unknown owner - C:\Programmi\File comuni\Symantec Shared\ccSvcHst.exe" /h ccCommon (file missing)
O23 - Service: LiveUpdate Notice Service - Unknown owner - C:\Programmi\File comuni\Symantec Shared\PIF\{B8E1DD85-8582-4c61-B58F-2F227FCA9A08}\PIFSvc.exe" /m "C:\Programmi\File comuni\Symantec Shared\PIF\{B8E1DD85-8582-4c61-B58F-2F227FCA9A08}\PifEng.dll (file missing)
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: Symantec Core LC - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\CCPD-LC\symlcsvc.exe
O23 - Service: Symantec AppCore Service (SymAppCore) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\AppCore\AppSvc32.exe
O23 - Service: UStorage Server Service - OTi - C:\WINDOWS\system32\UStorSrv.exe
O23 - Service: Utilità di pianificazione di LiveUpdate automatico - Symantec Corporation - C:\Programmi\Symantec\LiveUpdate\ALUSchedulerSvc.e xe