Allora:
- Sono riuscito a disinstallare NAV 2004
- Momentaneamente sono senza antivirus (ah il tuo link non va mi potresti dire il nome del freeware?)
Ecco il log del programma dinamite

Logfile of HijackThis v1.99.1
Scan saved at 17.32.02, on 13/09/2005
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:\WINDOWS\system32\S24EvMon.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\hkcmd.exe
C:\Programmi\Synaptics\SynTP\SynTPLpr.exe
C:\Programmi\Synaptics\SynTP\SynTPEnh.exe
C:\WINDOWS\Logi_MwX.Exe
C:\PROGRA~1\SYMNET~1\SNDMon.exe
C:\WINDOWS\SOUNDMAN.EXE
C:\WINDOWS\system32\igfxtray.exe
C:\WINDOWS\mHotkey.exe
C:\WINDOWS\system32\rundll32.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\MSN Messenger\MsnMsgr.Exe
C:\Programmi\Billionton\Bluetooth Software\BTTray.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Programmi\Billionton\Bluetooth Software\bin\btwdins.exe
C:\WINDOWS\system32\RegSrvc.exe
C:\WINDOWS\system32\slserv.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\msiexec.exe
C:\Documents and Settings\MARCO\Desktop\HijackThis.exe
C:\WINDOWS\system32\MsiExec.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.csr.unibo.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
O4 - HKLM\..\Run: [Menu] D:\Autorun.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\system32\hkcmd.exe
O4 - HKLM\..\Run: [SynTPLpr] C:\Programmi\Synaptics\SynTP\SynTPLpr.exe
O4 - HKLM\..\Run: [SynTPEnh] C:\Programmi\Synaptics\SynTP\SynTPEnh.exe
O4 - HKLM\..\Run: [PRONoMgr.exe] C:\Programmi\Intel\PROSetWireless\NCS\PROSet\PRONo Mgr.exe
O4 - HKLM\..\Run: [Logitech Utility] Logi_MwX.Exe
O4 - HKLM\..\Run: [Symantec NetDriver Monitor] C:\PROGRA~1\SYMNET~1\SNDMon.exe /Consumer
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [IgfxTray] C:\WINDOWS\system32\igfxtray.exe
O4 - HKLM\..\Run: [CHotkey] mHotkey.exe
O4 - HKLM\..\Run: [BluetoothAuthenticationAgent] rundll32.exe bthprops.cpl,,BluetoothAuthenticationAgent
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.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: BTTray.lnk = ?
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office\OSA9.EXE
O8 - Extra context menu item: Send To &Bluetooth - C:\Programmi\Billionton\Bluetooth Software\btsendto_ie_ctx.htm
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe (file missing)
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe (file missing)
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://update.microsoft.com/microsof...?1120644819391
O17 - HKLM\System\CCS\Services\Tcpip\..\{985BD231-FFD3-4EAB-97BA-E90013D84788}: NameServer = 151.99.125.2,151.99.184.201
O20 - Winlogon Notify: igfxcui - C:\WINDOWS\SYSTEM32\igfxsrvc.dll
O23 - Service: Bluetooth Service (btwdins) - WIDCOMM, Inc. - C:\Programmi\Billionton\Bluetooth Software\bin\btwdins.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\system32\HPZipm12.exe
O23 - Service: RegSrvc - Intel Corporation - C:\WINDOWS\system32\RegSrvc.exe
O23 - Service: Spectrum24 Event Monitor (S24EventMonitor) - Intel Corporation - C:\WINDOWS\system32\S24EvMon.exe
O23 - Service: SmartLinkService (SLService) - - C:\WINDOWS\SYSTEM32\slserv.exe
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\SNDSrvc.exe
O23 - Service: SymWMI Service (SymWSC) - Symantec Corporation - C:\Programmi\File comuni\Symantec Shared\Security Center\SymWSC.exe

Grazie mille per qualsiasi risposta.

P.S. Attendo con ansia il seguito del telefilm