Grazie Alfonso, ho fatto vari tentativi, ma mi si apre sempre una finestra in bianco senza alcun indirizzo, mentre prima vi erano i vari indirizzi utilizzati, ho anche sbloccato col dx la barra degli indirizzi, ma la finestra non riesco ad allungarla ma solo a diminuirla fino a scomparire, ti allego il log puo' essere qualche intrusione, ecco: Logfile of HijackThis v1.99.1
Scan saved at 17.23.49, on 12/01/2006
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\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Zone Labs\ZoneAlarm\zlclient.exe
C:\PROGRA~1\mcafee.com\agent\mcagent.exe
c:\progra~1\mcafee.com\vso\mcvsescn.exe
C:\Programmi\File comuni\EPSON\EBAPI\SAgent2.exe
c:\programmi\mcafee.com\agent\mcdetect.exe
c:\PROGRA~1\mcafee.com\agent\mctskshd.exe
c:\Programmi\File comuni\Microsoft Shared\VS7Debug\mdm.exe
C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe
C:\Programmi\Alcohol Soft\Alcohol 120\StarWind\StarWindService.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\PowerQuest\Drive Image 7.0\Agent\PQV2iSvc.exe
C:\WINDOWS\system32\ZoneLabs\vsmon.exe
C:\Programmi\Windows Media Player\wmplayer.exe
c:\PROGRA~1\mcafee.com\vso\mcvsshld.exe
c:\PROGRA~1\mcafee.com\vso\mcvsrte.exe
c:\PROGRA~1\mcafee.com\vso\mcshield.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Documents and Settings\User\Desktop\hijackthis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.poste.it/
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: Need2Find Bar BHO - {4D1C4E81-A32A-416b-BCDB-33B3EF3617D3} - C:\Programmi\Need2Find\bar\2.bin\ND2FNBAR.DLL
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Programmi\Spybot - Search & Destroy\SDHelper.dll
O2 - BHO: BitComet Toolbar Helper - {6A373B7E-496E-424f-A9BE-486A5E9AB018} - C:\Programmi\BitComet Toolbar\v2.0.0.1\BitComet_Toolbar.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\programmi\google\googletoolbar2.dll
O2 - BHO: AcroIEToolbarHelper Class - {AE7CD045-E861-484f-8273-0445EE161910} - C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll
O3 - Toolbar: Adobe PDF - {47833539-D0C5-4125-9FA8-0819E2EAAC93} - C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll
O3 - Toolbar: McAfee VirusScan - {BA52B914-B692-46c4-B683-905236F6F655} - c:\progra~1\mcafee.com\vso\mcvsshl.dll
O3 - Toolbar: BitComet Toolbar - {2E608F70-C430-4bc5-96F6-608E02EBA5B2} - C:\Programmi\BitComet Toolbar\v2.0.0.1\BitComet_Toolbar.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\programmi\google\googletoolbar2.dll
O3 - Toolbar: RX Toolbar - {25D8BACF-3DE2-4B48-AE22-D659B8D835B0} - C:\Programmi\RXToolBar\RXToolBar.dll
O4 - HKLM\..\Run: [Zone Labs Client] C:\Programmi\Zone Labs\ZoneAlarm\zlclient.exe
O4 - HKLM\..\Run: [MCUpdateExe] c:\PROGRA~1\mcafee.com\agent\mcupdate.exe
O4 - HKLM\..\Run: [MCAgentExe] c:\PROGRA~1\mcafee.com\agent\mcagent.exe
O4 - HKLM\..\Run: [VSOCheckTask] "c:\PROGRA~1\mcafee.com\vso\mcmnhdlr.exe" /checktask
O4 - HKLM\..\Run: [VirusScan Online] "c:\PROGRA~1\mcafee.com\vso\mcvsshld.exe"
O4 - HKLM\..\Run: [CleanUp] C:\PROGRA~1\McAfee.com\Shared\mcappins.exe /v=3 /cleanup
O8 - Extra context menu item: &Google Search - res://c:\programmi\google\GoogleToolbar2.dll/cmsearch.html
O8 - Extra context menu item: &Search - http://kw.bar.need2find.com/KW/menusearch.html?p=KW
O8 - Extra context menu item: &Translate English Word - res://c:\programmi\google\GoogleToolbar2.dll/cmwordtrans.html
O8 - Extra context menu item: Backward Links - res://c:\programmi\google\GoogleToolbar2.dll/cmbacklinks.html
O8 - Extra context menu item: Cached Snapshot of Page - res://c:\programmi\google\GoogleToolbar2.dll/cmcache.html
O8 - Extra context menu item: Convert link target to Adobe PDF - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: Convert link target to existing PDF - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIEAppend.html
O8 - Extra context menu item: Convert selected links to Adobe PDF - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIECaptureSelLinks.html
O8 - Extra context menu item: Convert selected links to existing PDF - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIEAppendSelLinks.html
O8 - Extra context menu item: Convert selection to Adobe PDF - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: Convert selection to existing PDF - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIEAppend.html
O8 - Extra context menu item: Convert to Adobe PDF - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: Convert to existing PDF - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIEAppend.html
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O8 - Extra context menu item: Similar Pages - res://c:\programmi\google\GoogleToolbar2.dll/cmsimilar.html
O8 - Extra context menu item: Translate Page into English - res://c:\programmi\google\GoogleToolbar2.dll/cmtrans.html
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programmi\Messenger\msmsgs.exe
O15 - Trusted Zone: www.archiviosex.net
O15 - Trusted Zone: www.redfunny.com
O15 - Trusted Zone: www.skymasters.biz
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/windowsupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1134230254437
O23 - Service: Acronis Scheduler2 Service (AcrSch2Svc) - Unknown owner - C:\Programmi\File comuni\Acronis\Schedule2\schedul2.exe (file missing)
O23 - Service: Adobe LM Service - Adobe Systems - C:\Programmi\File comuni\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: EPSON Printer Status Agent2 (EPSONStatusAgent2) - SEIKO EPSON CORPORATION - C:\Programmi\File comuni\EPSON\EBAPI\SAgent2.exe
O23 - Service: Servizio iPod (iPodService) - Apple Computer, Inc. - C:\Programmi\iPod\bin\iPodService.exe
O23 - Service: McAfee WSC Integration (McDetect.exe) - McAfee, Inc - c:\programmi\mcafee.com\agent\mcdetect.exe
O23 - Service: McAfee.com McShield (McShield) - Unknown owner - c:\PROGRA~1\mcafee.com\vso\mcshield.exe
O23 - Service: McAfee Task Scheduler (McTskshd.exe) - McAfee, Inc - c:\PROGRA~1\mcafee.com\agent\mctskshd.exe
O23 - Service: McAfee SecurityCenter Update Manager (mcupdmgr.exe) - McAfee, Inc - C:\PROGRA~1\McAfee.com\Agent\mcupdmgr.exe
O23 - Service: McAfee.com VirusScan Online Realtime Engine (MCVSRte) - Networks Associates Technology, Inc - c:\PROGRA~1\mcafee.com\vso\mcvsrte.exe
O23 - Service: SmartLinkService (SLService) - Smart Link - C:\WINDOWS\SYSTEM32\slserv.exe
O23 - Service: SoundMAX Agent Service (SoundMAX Agent Service (default)) - Analog Devices, Inc. - C:\Programmi\Analog Devices\SoundMAX\SMAgent.exe
O23 - Service: StarWind iSCSI Service (StarWindService) - Rocket Division Software - C:\Programmi\Alcohol Soft\Alcohol 120\StarWind\StarWindService.exe
O23 - Service: TuneUp WinStyler Theme Service (TUWinStylerThemeSvc) - TuneUp Software GmbH - C:\Programmi\TuneUp Utilities 2006\WinStylerThemeSvc.exe
O23 - Service: V2i Protector - PowerQuest Corporation - C:\Programmi\PowerQuest\Drive Image 7.0\Agent\PQV2iSvc.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs, LLC - C:\WINDOWS\system32\ZoneLabs\vsmon.exe

Grazie mille Alfonso,ti rinnovo i miei complimenti, tutto ok, la finestra e' ritornata alla normalita', vi erano i soliti intrusi.Ti seguo sempre e sto imparando sempre di piu'.Ciao