Cosa strana: questo redirezionamento funzia anche con Opera. Vi posto il log. premetto che dal suddetto pc ho rimosso 120 malware. Il file vtstt.dll si ricrea sempre fra le voci di Hijackthis.

Logfile of HijackThis v1.99.1
Scan saved at 18.57.36, on 16/01/2006
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2600.0000)

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:\WINDOWS\system32\rundll32.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\File comuni\EPSON\EBAPI\SAgent2.exe
C:\WINDOWS\system32\slserv.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\ZoneLabs\vsmon.exe
C:\Programmi\Microsoft Works\WkDetect.exe
C:\WINDOWS\System32\atiptaxx.exe
C:\Programmi\Hewlett-Packard\PhotoSmart\HP Share-to-Web\hpgs2wnd.exe
C:\Programmi\Hewlett-Packard\PhotoSmart\Photo Imaging\Hpi_Monitor.exe
C:\Programmi\Zone Labs\ZoneAlarm\zlclient.exe
C:\WINDOWS\System32\ctfmon.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\Hewlett-Packard\Digital Imaging\bin\hpohmr08.exe
C:\Programmi\Hewlett-Packard\Digital Imaging\bin\hpotdd01.exe
C:\Programmi\File comuni\Microsoft Shared\Works Shared\wkcalrem.exe
C:\Programmi\Alice ti aiuta\bin\mpbtn.exe
C:\PROGRA~1\HEWLET~1\PHOTOS~1\HPSHAR~1\hpgs2wnf.ex e
C:\Programmi\Hewlett-Packard\Digital Imaging\bin\hpoevm08.exe
C:\Programmi\Hewlett-Packard\Digital Imaging\Bin\hpoSTS08.exe
C:\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://gw.aliceadsl.it/home
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Microsoft Internet Explorer fornito da Alice
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Int ernet Settings,ProxyOverride = 127.0.0.1
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: ATLDistrib Object - {83A5F7B7-DC75-44CE-9195-264F41709FA9} - C:\WINDOWS\System32\vtstt.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O4 - HKLM\..\Run: [Microsoft Works Portfolio] C:\Programmi\Microsoft Works\WksSb.exe /AllUsers
O4 - HKLM\..\Run: [Microsoft Works Update Detection] C:\Programmi\Microsoft Works\WkDetect.exe
O4 - HKLM\..\Run: [AtiPTA] atiptaxx.exe
O4 - HKLM\..\Run: [Share-to-Web Namespace Daemon] C:\Programmi\Hewlett-Packard\PhotoSmart\HP Share-to-Web\hpgs2wnd.exe
O4 - HKLM\..\Run: [NeroCheck] C:\WINDOWS\System32\NeroCheck.exe
O4 - HKLM\..\Run: [ALCalendar] yes
O4 - HKLM\..\Run: [FaxPrint] "C:\Programmi\4Team Corporation\Fax4Outlook\\PrintFax.exe"
O4 - HKLM\..\Run: [CXMon] "C:\Programmi\Hewlett-Packard\PhotoSmart\Photo Imaging\Hpi_Monitor.exe"
O4 - HKLM\..\Run: [Windows Logon Application] C:\WINDOWS\System32\winIogon.exe
O4 - HKLM\..\Run: [Zone Labs Client] "C:\Programmi\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [WashAndGo - Cleanup of old Backupfiles] "C:\Programmi\WashAndGo\Checker.exe /check"
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Programmi\File comuni\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Alice ti aiuta.lnk = C:\Programmi\Alice ti aiuta\bin\matcli.exe
O4 - Global Startup: hp psc 1000 series.lnk = ?
O4 - Global Startup: hpoddt01.exe.lnk = ?
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office\OSA9.EXE
O4 - Global Startup: Promemoria del Calendario di Microsoft Works.lnk = ?
O9 - Extra button: ICQ Pro - {6224f700-cba3-4071-b251-47cb894244cd} - C:\Programmi\ICQ\ICQ.exe
O9 - Extra 'Tools' menuitem: ICQ - {6224f700-cba3-4071-b251-47cb894244cd} - C:\Programmi\ICQ\ICQ.exe
O9 - Extra button: Organizzatore ricerche - {9455301C-CF6B-11D3-A266-00C04F689C50} - C:\Programmi\File comuni\Microsoft Shared\Reference 2001\EROProj.dll
O14 - IERESET.INF: START_PAGE_URL=http://gw.aliceadsl.it/home
O20 - Winlogon Notify: App Management - C:\WINDOWS\system32\jt2o07f3e.dll
O20 - Winlogon Notify: vtstt - C:\WINDOWS\System32\vtstt.dll
O23 - Service: Command Service (cmdService) - Unknown owner - C:\WINDOWS\THVjYQ\command.exe (file missing)
O23 - Service: EPSON Printer Status Agent2 (EPSONStatusAgent2) - SEIKO EPSON CORPORATION - C:\Programmi\File comuni\EPSON\EBAPI\SAgent2.exe
O23 - Service: Network Monitor - Unknown owner - C:\Programmi\Network Monitor\netmon.exe (file missing)
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\System32\HPZipm12.exe
O23 - Service: Service Hosts (ServiceHost) - Unknown owner - C:\WINDOWS\shost.exe (file missing)
O23 - Service: SmartLinkService (SLService) - - C:\WINDOWS\SYSTEM32\slserv.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs LLC - C:\WINDOWS\system32\ZoneLabs\vsmon.exe

Il sistema sarà quanto prima aggiornato al SP2. ora vorrei risolvere questa cosa. grazie a tutti quelli che vorranno rispondermi. cya!