Ciao Alfonso, grazie per l'aiuto. ecco il log completo:

Logfile of HijackThis v1.97.7
Scan saved at 1.58.17, on 23/03/2005
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 (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:\Programmi\File comuni\Symantec Shared\ccEvtMgr.exe
C:\Programmi\Norton Internet Security\NISUM.EXE
C:\WINDOWS\Explorer.EXE
C:\Programmi\File comuni\Symantec Shared\ccApp.exe
C:\Programmi\QuickTime\qttask.exe
C:\Programmi\Java\jre1.5.0_01\bin\jusched.exe
C:\Programmi\Symantec\Norton Ghost 2003\GhostStartTrayApp.exe
C:\Programmi\File comuni\Real\Update_OB\realsched.exe
C:\WINDOWS\System32\ctfmon.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\Nikon\NkView6\NkvMon.exe
C:\Programmi\Norton Internet Security\ccPxySvc.exe
C:\PROGRA~1\Symantec\NORTON~1\GHOSTS~2.EXE
C:\Programmi\File comuni\Microsoft Shared\VS7Debug\mdm.exe
C:\Programmi\Norton AntiVirus\navapsvc.exe
C:\WINDOWS\System32\svchost.exe
C:\Programmi\File comuni\Ulead Systems\DVD\ULCDRSvr.exe
C:\WINDOWS\System32\wuauclt.exe
C:\Programmi\Internet Explorer\iexplore.exe
E:\ierunner.exe
E:\ierunner.exe
E:\CD1\SICUREZZA\HijackThis\HijackThis.exe
C:\Programmi\Microsoft Office\Office10\EXCEL.EXE
C:\Programmi\Outlook Express\msimn.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.azesearch.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O1 - Hosts: 69.50.166.11 google.co.uk
O1 - Hosts: 69.50.166.11 www.google.es
O1 - Hosts: 69.50.166.11 google.es
O1 - Hosts: 69.50.166.11 google.com.au
O1 - Hosts: 69.50.166.14 yahoo.com
O1 - Hosts: 69.50.166.12 www.go.com
O1 - Hosts: 69.50.166.12 go.com
O1 - Hosts: 69.50.166.13 astalavista.com
O1 - Hosts: 69.50.166.13 www.astalavista.com
O1 - Hosts: 69.50.166.13 astalavista.box.sk
O1 - Hosts: 69.50.166.13 cracks.am
O1 - Hosts: 69.50.166.13 www.cracks.am
O2 - BHO: (no name) - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {1474CE44-8057-4AE3-8F3E-ED37C7C63D8A} - C:\WINDOWS\system32\iasad.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Programmi\Spybot - Search & Destroy\SDHelper.dll
O2 - BHO: NAV Helper - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Programmi\Norton AntiVirus\NavShExt.dll
O2 - BHO: (no name) - {FFF5092F-7172-4018-827B-FA5868FB0478} - C:\WINDOWS\System32\azesearch2.ocx
O3 - Toolbar: AZE Search - {A6790AA5-C6C7-4BCF-A46D-0FDAC4EA90EB} - C:\WINDOWS\System32\azesearch2.ocx
O4 - HKLM\..\Run: [ccApp] "C:\Programmi\File comuni\Symantec Shared\ccApp.exe"
O4 - HKLM\..\Run: [ccRegVfy] "C:\Programmi\File comuni\Symantec Shared\ccRegVfy.exe"
O4 - HKLM\..\Run: [Symantec NetDriver Monitor] C:\PROGRA~1\SYMNET~1\SNDMon.exe
O4 - HKLM\..\Run: [SSC_UserPrompt] C:\Programmi\File comuni\Symantec Shared\Security Center\UsrPrmpt.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [PinnacleDriverCheck] C:\WINDOWS\System32\PSDrvCheck.exe -CheckReg
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Programmi\Java\jre1.5.0_01\bin\jusched.exe
O4 - HKLM\..\Run: [GhostStartTrayApp] C:\Programmi\Symantec\Norton Ghost 2003\GhostStartTrayApp.exe
O4 - HKLM\..\Run: [TkBellExe] "C:\Programmi\File comuni\Real\Update_OB\realsched.exe" -osboot
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Programmi\File comuni\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: NkvMon.exe.lnk = C:\Programmi\Nikon\NkView6\NkvMon.exe
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra 'Tools' menuitem: Sun Java Console (HKLM)
O9 - Extra button: Messenger (HKLM)
O9 - Extra 'Tools' menuitem: Windows Messenger (HKLM)
O15 - Trusted Zone: www.master69.biz
O15 - Trusted Zone: www.sgrunt.biz
O15 - Trusted Zone: www.yeak.net
O16 - DPF: {15AD6789-CDB4-47E1-A9DA-992EE8E6BAD6} - http://static.windupdates.com/cab/6247971CanadaInc/ie/bridge-c283.cab
O16 - DPF: {3E68E405-C6DE-49FF-83AE-41EE9F4C36CE} (Office Update Installation Engine) - http://office.microsoft.com/officeupdate/content/opuc2.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://v5.windowsupdate.microsoft.com/v5consumer/V5Controls/en/x86/client/wuweb_site.cab?1109720012811
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab
O16 - DPF: {D7BF3304-138B-4DD5-86EE-491BB6A2286C} (CParamWr Class) - http://toolbar.azesearch.com/install/azesearch.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{9F4FC920-0299-4780-8D28-84FE69687A79}: NameServer = 217.141.254.206 151.99.125.1

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Collaboratore Aiutamici

Ok sembra tutto risolto. Grazie mille sei stato gentilissimo