Salve Ragioniere ho fatto come hai detto, pero il problema rimane. Quando prova ad aprire il disco C: da risorse del computer mi appare una finestra con scritto: Impossibile trovare dkcstitzl.exe
questo programma è necessario per aprire i fili di tipo "file".
Le finestre si muovono a rallentatore.
Le righe di registro che mi hai detto di toglire, inizialmente si sono tolte, pero poi sono tornate e non sono riuscito a trovare le prime righe che iniziano con C: ( dove sono? ).
Ti mando il nuovo logfile spero si posa fare qualcosa.
Grazie Massimo
Logfile of HijackThis v1.99.1
Scan saved at 22.56.52, on 12/11/2007
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\Alwil Software\Avast4\aswUpdSv.exe
C:\Programmi\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\PROGRA~1\ALICET~1\SMARTB~1\MotiveSB.exe
C:\WINDOWS\System32\spool\drivers\w32x86\3\hpztsb09.exe
C:\Programmi\Hewlett-Packard\HP Software Update\HPWuSchd.exe
C:\Programmi\Hewlett-Packard\Digital Imaging\bin\hpotdd01.exe
C:\Programmi\Creative\Creative Live! Cam\VideoFX\StartFX.exe
C:\Programmi\Nokia\Nokia PC Suite 6\LaunchApplication.exe
C:\WINDOWS\System32\ctfmon.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\Alwil Software\Avast4\ashWebSv.exe
C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
C:\Programmi\PC Connectivity Solution\ServiceLayer.exe
C:\Programmi\Alice ti aiuta\bin\mpbtn.exe
C:\Programmi\Protezione\hijack this 1.99.1\hijackthis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.hotinfolink.com
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = 127.0.0.1
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Programmi\Spybot - Search and Destroy\SDHelper.dll
O3 - Toolbar: andRadio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O4 - HKLM\..\Run: [Motive SmartBridge] C:\PROGRA~1\ALICET~1\SMARTB~1\MotiveSB.exe
O4 - HKLM\..\Run: [HPDJ Taskbar Utility] C:\WINDOWS\System32\spool\drivers\w32x86\3\hpztsb09.exe
O4 - HKLM\..\Run: [HP Software Update] "C:\Programmi\Hewlett-Packard\HP Software Update\HPWuSchd.exe"
O4 - HKLM\..\Run: [DeviceDiscovery] C:\Programmi\Hewlett-Packard\Digital Imaging\bin\hpotdd01.exe
O4 - HKLM\..\Run: [AVFX Engine] C:\Programmi\Creative\Creative Live! Cam\VideoFX\StartFX.exe
O4 - HKLM\..\Run: [KernelFaultCheck] :systemroot:\system32\dumprep 0 -k
O4 - HKLM\..\Run: [PCSuiteTrayApplication] C:\Programmi\Nokia\Nokia PC Suite 6\LaunchApplication.exe -startup
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - Global Startup: Alice ti aiuta.lnk = C:\Programmi\Alice ti aiuta\bin\matcli.exe
O9 - Extra button: Related - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
O9 - Extra 'Tools' menuitem: Show &Related Links - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - ALWIL Software - C:\Programmi\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - C:\Programmi\Alwil Software\Avast4\ashWebSv.exe" /service (file missing)
O23 - Service: ServiceLayer - Nokia. - C:\Programmi\PC Connectivity Solution\ServiceLayer.exe
O23 - Service: Windows User Mode Driver Framework (UMWdf) - Unknown owner - C:\WINDOWS\System32\wdfmgr.exe (file missing)