Ho scaricato un file probabilmente infetto e il primo sintomo è stato che active virus shield è scomparso. L' ho disinstallato e Poi ho installato di tutto: f.secure, nod 32 , avg, panda, ma tutti davano un messaggio di errore e non proseguivano l'installazione. L'unica cosa che sembrava funzionare era il norton gratuito , quello che si scarica da Google PAck e mi ha segnalato un trojan mitliedger. Dovrebbe averlo pulito , ma gli antivirus non si installano ancora. Avete qualche soluzione?

Allego il Logfile of HijackThis v1.99.1
Scan saved at 0.11.19, on 23/06/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16473)

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:\Programmi\Windows Defender\MsMpEng.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Google\Common\Google Updater\GoogleUpdaterService.exe
C:\Programmi\File comuni\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\WINDOWS\system32\nvsvc32.exe
C:\WINDOWS\system32\oodag.exe
C:\WINDOWS\system32\HPZipm12.exe
C:\Programmi\SiteAdvisor\6066\SAService.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\WgaTray.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\SiteAdvisor\6066\SiteAdv.exe
C:\Programmi\Windows Defender\MSASCui.exe
C:\Programmi\File comuni\Real\Update_OB\realsched.exe
C:\Programmi\Java\jre1.6.0_01\bin\jusched.exe
C:\WINDOWS\sm56hlpr.exe
C:\Programmi\QuickTime\qttask.exe
C:\Programmi\Picasa2\PicasaMediaDetector.exe
C:\WINDOWS\system32\RUNDLL32.EXE
C:\Programmi\HP\HP Software Update\HPWuSchd2.exe
C:\WINDOWS\Mixer.exe
C:\Programmi\Microsoft Encarta\Microsoft Encarta Enciclopedia DVD - 2006\EDICT.EXE
C:\Programmi\Spamihilator\spamihilator.exe
C:\Programmi\UnH Solutions\IE Privacy Keeper\IEPrivacyKeeper.exe
C:\WINDOWS\System32\svchost.exe
C:\Programmi\File comuni\Ahead\Lib\NMBgMonitor.exe
C:\Programmi\File comuni\Ahead\Lib\NMIndexStoreSvr.exe
C:\Programmi\Google\Google Updater\GoogleUpdater.exe
C:\Programmi\HP\Digital Imaging\bin\hpqtra08.exe
C:\Programmi\HP\Digital Imaging\bin\hpqSTE08.exe
C:\Documents and Settings\landogiu\Documenti\SICUREZZA\TOOLRIMOZVIRUS\trend micro\sysclean.com
C:\Documents and Settings\landogiu\Documenti\SICUREZZA\TOOLRIMOZVIRUS\trend micro\sysclean.exe
C:\Documents and Settings\landogiu\Desktop\hijackthis_sfx\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://news.google.it/news?ned=it
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
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
R3 - URLSearchHook: Yahoo! Toolbar con blocco Pop-Up - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - (no file)
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {089FD14D-132B-48FC-8861-0048AE113215} - C:\Programmi\SiteAdvisor\6066\SiteAdv.dll
O2 - BHO: (no name) - {2DA90FD4-67CE-4BD3-8987-2B8884109C38} - (no file)
O2 - BHO: (no name) - {376DD8FE-253D-453B-9081-FC67EB9647C8} - (no file)
O2 - BHO: (no name) - {54294BD5-CB8F-44CD-8AD8-1C95965636F3} - (no file)
O2 - BHO: (no name) - {56083805-1AD9-4DF0-8575-C3367C1BC41C} - (no file)
O2 - BHO: (no name) - {72396739-2B99-49E1-9D1E-94E165DBB5BC} - (no file)
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programmi\Java\jre1.6.0_01\bin\ssv.dll
O2 - BHO: Encarta Web Companion Oggetto helper - {955BE0B8-BC85-4CAF-856E-8E0D8B610560} - C:\Programmi\File comuni\Microsoft Shared\Encarta Web Companion\ENCWCBAR.DLL
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\programmi\google\googletoolbar1.dll
O2 - BHO: Adobe PDF Conversion Toolbar Helper - {AE7CD045-E861-484f-8273-0445EE161910} - C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Programmi\Google\GoogleToolbarNotifier\2.0.301.7164\swg.dll
O3 - Toolbar: Adobe PDF - {47833539-D0C5-4125-9FA8-0819E2EAAC93} - C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll
O3 - Toolbar: McAfee SiteAdvisor - {0BF43445-2F28-4351-9252-17FE6E806AA0} - C:\Programmi\SiteAdvisor\6066\SiteAdv.dll
O3 - Toolbar: Encarta Web Companion - {147D6308-0614-4112-89B1-31402F9B82C4} - C:\Programmi\File comuni\Microsoft Shared\Encarta Web Companion\ENCWCBAR.DLL
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\programmi\google\googletoolbar1.dll
O4 - HKLM\..\Run: [Windows Defender] "C:\Programmi\Windows Defender\MSASCui.exe" -hide
O4 - HKLM\..\Run: [TkBellExe] "C:\Programmi\File comuni\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\Java\jre1.6.0_01\bin\jusched.exe"
O4 - HKLM\..\Run: [SMSERIAL] sm56hlpr.exe
O4 - HKLM\..\Run: [SiteAdvisor] C:\Programmi\SiteAdvisor\6066\SiteAdv.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [Picasa Media Detector] C:\Programmi\Picasa2\PicasaMediaDetector.exe
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [NeroFilterCheck] C:\Programmi\File comuni\Ahead\Lib\NeroCheck.exe
O4 - HKLM\..\Run: [HP Software Update] C:\Programmi\HP\HP Software Update\HPWuSchd2.exe
O4 - HKLM\..\Run: [C-Media Mixer] Mixer.exe /startup
O4 - HKCU\..\Run: [E06IXLRD_246640] "C:\Programmi\Microsoft Encarta\Microsoft Encarta Enciclopedia DVD - 2006\EDICT.EXE" -m
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [swg] C:\Programmi\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
O4 - HKCU\..\Run: [Spamihilator] "C:\Programmi\Spamihilator\spamihilator.exe"
O4 - HKCU\..\Run: [IE Privacy Keeper] "C:\Programmi\UnH Solutions\IE Privacy Keeper\IEPrivacyKeeper.exe" -startup
O4 - HKCU\..\Run: [E06IXLRD_267843] "C:\Programmi\Microsoft Encarta\Microsoft Encarta Enciclopedia DVD - 2006\EDICT.EXE" -m
O4 - HKCU\..\Run: [E06IXLRD_2334796] "C:\Programmi\Microsoft Encarta\Microsoft Encarta Enciclopedia DVD - 2006\EDICT.EXE" -m
O4 - HKCU\..\Run: [BgMonitor_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "C:\Programmi\File comuni\Ahead\Lib\NMBgMonitor.exe"
O4 - Global Startup: Avvio veloce di Adobe Acrobat.lnk = ?
O4 - Global Startup: Google Updater.lnk = C:\Programmi\Google\Google Updater\GoogleUpdater.exe
O4 - Global Startup: HP Digital Imaging Monitor.lnk = C:\Programmi\HP\Digital Imaging\bin\hpqtra08.exe
O8 - Extra context menu item: Aggiungi a &Windows Live Favorites - http://favorites.live.com/quickadd.aspx
O8 - Extra context menu item: Converti destinazione link in Adobe PDF - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: Converti destinazione link in file PDF esistente - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIEAppend.html
O8 - Extra context menu item: Converti i link selezionati in Adobe PDF - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIECaptureSelLinks.html
O8 - Extra context menu item: Converti i link selezionati in file PDF esistente - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIEAppendSelLinks.html
O8 - Extra context menu item: Converti in Adobe PDF - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: Converti nel file PDF esistente - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIEAppend.html
O8 - Extra context menu item: Converti selezione in Adobe PDF - res://C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: Converti selezione in file PDF esistente - 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: Save Flash - res://C:\Programmi\UnH Solutions\Flash Saving Plugin\FlashSButton.dll/210
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.6.0_01\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.6.0_01\bin\ssv.dll
O9 - Extra button: Internet Radio by Endicosoft.com - {1F958B09-3312-7f0e-9723-4C1324C57B20} - C:\WINDOWS\system32\shdocvw.dll
O9 - Extra button: Ricerche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: Flash - {43CF38F3-5AEC-45a3-AD31-04EB06E9C6CA} - C:\Programmi\UnH Solutions\Flash Saving Plugin\FlashSButton.dll (HKCU)
O11 - Options group: [INTERNATIONAL] International*
O16 - DPF: {512FC5A1-7DE1-43F1-BC0C-371622FCB409} (TotalScan Installer Class) - http://www.nanoscan.com/as/v1/cabs/ascstubie.cab
O16 - DPF: {77F539E4-3C23-48D9-960B-B6E62905C113} - https://favorites.live.com/cab/ImportAx.cab
O18 - Protocol: siteadvisor - {3A5DC592-7723-4EAA-9EE6-AF4222BCF879} - C:\Programmi\SiteAdvisor\6066\SiteAdv.dll
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - C:\WINDOWS\system32\WPDShServiceObj.dll
O23 - Service: Adobe LM Service - Adobe Systems - C:\Programmi\File comuni\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Programmi\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: NBService - Nero AG - C:\Programmi\Nero\Nero 7\Nero BackItUp\NBService.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: O&O Defrag - O&O Software GmbH - C:\WINDOWS\system32\oodag.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\system32\HPZipm12.exe
O23 - Service: SiteAdvisor Service - McAfee, Inc. - C:\Programmi\SiteAdvisor\6066\SAService.exe