Il risultato è negativo, e il virus è sempre presente.
Eccoti il log:
Logfile of HijackThis v1.99.1
Scan saved at 12.46.44, on 22/07/2006
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:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
C:\Programmi\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\System32\nvsvc32.exe
C:\Programmi\SlipStream Web Accelerator\slipcore.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\WINDOWS\Temp\panh1.exe
C:\WINDOWS\System32\ctfmon.exe
C:\Programmi\SlipStream Web Accelerator\slipgui.exe
C:\Programmi\Alwil Software\Avast4\ashWebSv.exe
C:\Programmi\WinZip\WZQKPICK.EXE
C:\Programmi\Alwil Software\Avast4\ashMaiSv.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\PROGRA~1\WINZIP\winzip32.exe
C:\Documents and Settings\Proprietario\Impostazioni locali\Temp\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://google.icq.com/search/search_frame.php
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.beppegrillo.it/
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyServer = http=127.0.0.1:5400
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
R3 - Default URLSearchHook is missing
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: Class - {1A757BC7-CCA4-8EB1-6B04-0458C46C5E14} - C:\WINDOWS\phmwp1.dll (file missing)
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: (no name) - {BA52B914-B692-46c4-B683-905236F6F655} - (no file)
O3 - Toolbar: SlipStream Web Accelerator - {8B79EE88-E62D-4AA8-B530-CC357BA112B7} - C:\Programmi\SlipStream Web Accelerator\Toolband.dll
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [MPFTray] C:\PROGRA~1\McAfee.com\PERSON~1\MpfTray.exe
O4 - HKLM\..\Run: [SlipStream] "C:\Programmi\SlipStream Web Accelerator\slipcore.exe"
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\System32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [NAV_Update] C:\NAV_Update.exe
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [Windows Automatic Updates] C:\prz.exe
O4 - HKLM\..\Run: [notes] notepaad.exe
O4 - HKLM\..\Run: [panh1.exe] C:\WINDOWS\Temp\panh1.exe
O4 - HKLM\..\RunServices: [notes] notepaad.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [Windows Media Updater] crease.exe
O4 - Global Startup: Alice ti aiuta.lnk = C:\Programmi\Alice ti aiuta\bin\matcli.exe
O4 - Global Startup: Avvio veloce di Adobe Reader.lnk = ?
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: SlipStream Web Accelerator.lnk = C:\Programmi\SlipStream Web Accelerator\slipgui.exe
O4 - Global Startup: WinZip Quick Pick.lnk = C:\Programmi\WinZip\WZQKPICK.EXE
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~3\Office10\EXCEL.EXE/3000
O8 - Extra context menu item: Mostra immagine originale - res://C:\Programmi\SlipStream Web Accelerator\gui_resource.dll/328
O8 - Extra context menu item: Mostra tutte le immagini originali - res://C:\Programmi\SlipStream Web Accelerator\gui_resource.dll/327
O9 - Extra button: Browser Adjustment - {44627E97-789B-40d4-B5C2-58BD171129A1} - C:\PROGRA~1\Agnitum\OUTPOS~1.0\Plugins\BrowserBar\ie_bar.dll (file missing)
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\MSMSGS.EXE
O9 - Extra 'Tools' menuitem: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\MSMSGS.EXE
O12 - Plugin for .pdf: C:\Programmi\Internet Explorer\PLUGINS\nppdf32.dll
O16 - DPF: {4ED9DDF0-7479-4BBE-9335-5A1EDB1D8A21} - http://download.mcafee.com/molbin/shared/mcinsctl/it/4,0,0,83/mcinsctl.cab
O16 - DPF: {BCC0FF27-31D9-4614-A68E-C18E1ADA4389} - http://download.mcafee.com/molbin/shared/mcgdmgr/it/1,0,0,20/mcgdmgr.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{1F6E0DFD-DE33-479B-8BFC-75571FF2F79C}: NameServer = 193.70.152.15 193.70.152.25
O17 - HKLM\System\CS1\Services\Tcpip\..\{1F6E0DFD-DE33-479B-8BFC-75571FF2F79C}: NameServer = 193.70.152.15 193.70.152.25
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - Unknown owner - C:\Programmi\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - Unknown owner - 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: NetMot - Unknown owner - C:\:PLxOS.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: Remote Procedure Call (RPC) Monitoring (RpcMon) - Unknown owner - C:\WINDOWS\System32\Rpcmon.exe (file missing)

Grazie ancora

Steven é sufficiente ringraziarti? Con molta calma in settimana eseguirò ciò che mi hai indicato.
Buona notte