ciao,
il PC mi fa strane cose: non si aggiorna più in automatico l'antivirus AVIRA, nelle mail in outlook (2000) non riesco a vedere le immagini, l' istallazione di Spybot non è riuscita perchè non è riuscito a connettersi.... è come se non si riuscisse più a connettersi a determinati indirizzi IP, però navigo normalmente, riesco a scaricare da Firefox e l' HOST è pulito. Sistema operativo XP.

ciao
grazie

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 23.52.58, on 20/11/2011
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP3 (6.00.2900.5512)
Boot mode: Normal

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\nvsvc32.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Avira\AntiVir Desktop\sched.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\RUNDLL32.EXE
C:\WINDOWS\RTHDCPL.EXE
C:\Programmi\Avira\AntiVir Desktop\avgnt.exe
C:\Programmi\Hewlett-Packard\HP Deskjet 1280\Toolbox\mpm.exe
C:\Programmi\Ahead\InCD\InCD.exe
C:\Programmi\File comuni\Java\Java Update\jusched.exe
C:\Programmi\Vimicro Corporation\VMUVC\VMonitor.exe
C:\PROGRA~1\ALICET~1\vendors\AliceRE\content\template\DRIVEN~1\syncer\MCCITR~1.EXE
C:\Programmi\Adobe\Acrobat 7.0\Distillr\Acrotray.exe
C:\Programmi\Avira\AntiVir Desktop\avguard.exe
C:\Programmi\Bonjour\mDNSResponder.exe
C:\WINDOWS\system32\drivers\CDAC11BA.EXE
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\Common Files\Motive\McciCMService.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Microsoft ActiveSync\Wcescomm.exe
C:\Programmi\Messenger\msmsgs.exe
C:\Programmi\Avira\AntiVir Desktop\avshadow.exe
C:\Programmi\File comuni\Nero\Nero BackItUp 4\NBService.exe
C:\PROGRA~1\MICROS~3\rapimgr.exe
C:\Programmi\Telecom Italia\WanMiniport1st\srvany.exe
C:\Programmi\Telecom Italia\WanMiniport1st\WanMiniport1st_srv.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\Avira\AntiVir Desktop\AVWEBGRD.EXE
C:\WINDOWS\system32\wbem\wmiapsrv.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Programmi\Hewlett-Packard\HP Deskjet 1280\Toolbox\HPWSTBX.exe
C:\WINDOWS\system32\config\systemprofile\Impostazioni locali\Dati applicazioni\Application Policy Service\svchost.exe
C:\WINDOWS\system32\config\systemprofile\Impostazioni locali\Dati applicazioni\Application Policy Service\svchost.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Programmi\Mozilla Firefox\plugin-container.exe
C:\WINDOWS\system32\msiexec.exe
C:\Programmi\Trend Micro\HiJackThis\HiJackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.tiscali.it/
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.bigseekpro.com/videodownloadtoolbar/{70DE661D-3A3B-4A57-BADE-CCE2C1FEA26F}
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyServer = http=127.0.0.1:54545
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
R3 - URLSearchHook: UrlSearchHook Class - {00000000-6E41-4FD3-8538-502F5495E5FC} - C:\Programmi\Ask.com\GenericAskToolbar.dll
R3 - URLSearchHook: ToolbarURLSearchHook Class - {CA3EB689-8F09-4026-AA10-B9534C691CE0} - C:\Programmi\Video Download DB Toolbar\tbhelper.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Programmi\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: AcroIEToolbarHelper Class - {AE7CD045-E861-484f-8273-0445EE161910} - C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll
O2 - BHO: SkypeIEPluginBHO - {AE805869-2E5C-4ED4-8F7B-F1F7851A4497} - C:\Programmi\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O2 - BHO: Video Download Toolbar Intercept - {B29002A0-87A1-4DC4-AC55-5982034EB61E} - C:\Programmi\VideoDownloadToolbar\VideoDownloadToolbarIntercept.dll
O2 - BHO: Ask Toolbar BHO - {D4027C7F-154A-4066-A1AD-4243D8127440} - C:\Programmi\Ask.com\GenericAskToolbar.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Programmi\Java\jre6\bin\jp2ssv.dll
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - C:\Programmi\Java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
O2 - BHO: SMTTB2009 - {FCBCCB87-9224-4B8D-B117-F56D924BEB18} - C:\Programmi\Video Download DB Toolbar\tbcore3.dll
O3 - Toolbar: Video Download DB Toolbar - {338B4DFE-2E2C-4338-9E41-E176D497299E} - C:\Programmi\Video Download DB Toolbar\tbcore3.dll
O3 - Toolbar: Adobe PDF - {47833539-D0C5-4125-9FA8-0819E2EAAC93} - C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll
O3 - Toolbar: Ask Toolbar - {D4027C7F-154A-4066-A1AD-4243D8127440} - C:\Programmi\Ask.com\GenericAskToolbar.dll
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: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [Alcmtr] ALCMTR.EXE
O4 - HKLM\..\Run: [avgnt] "C:\Programmi\Avira\AntiVir Desktop\avgnt.exe" /min
O4 - HKLM\..\Run: [HPWS myPrintMileage Agent] C:\Programmi\Hewlett-Packard\HP Deskjet 1280\Toolbox\mpm.exe
O4 - HKLM\..\Run: [NeroCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [InCD] C:\Programmi\Ahead\InCD\InCD.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\File comuni\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [AdobeAAMUpdater-1.0] "C:\Programmi\File comuni\Adobe\OOBE\PDApp\UWA\UpdaterStartupUtility.exe"
O4 - HKLM\..\Run: [SwitchBoard] C:\Programmi\File comuni\Adobe\SwitchBoard\SwitchBoard.exe
O4 - HKLM\..\Run: [AdobeCS5ServiceManager] "C:\Programmi\File comuni\Adobe\CS5ServiceManager\CS5ServiceManager.exe" -launchedbylogin
O4 - HKLM\..\Run: [VMonitorVMUVC] "C:\Programmi\Vimicro Corporation\VMUVC\VMonitor.exe" VMUVC
O4 - HKLM\..\Run: [Motive SmartBridge] C:\PROGRA~1\ALICET~1\SMARTB~1\MotiveSB.exe
O4 - HKLM\..\Run: [AliceRE_McciTrayApp] C:\PROGRA~1\ALICET~1\vendors\AliceRE\content\template\DRIVEN~1\syncer\MCCITR~1.EXE
O4 - HKLM\..\Run: [Acrobat Assistant 7.0] "C:\Programmi\Adobe\Acrobat 7.0\Distillr\Acrotray.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [H/PC Connection Agent] "C:\Programmi\Microsoft ActiveSync\Wcescomm.exe"
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - Startup: Alice ADSL.lnk = C:\WINDOWS\system32\rasphone.exe
O4 - Global Startup: Adobe Acrobat Speed Launcher.lnk = ?
O4 - Global Startup: Adobe Gamma.lnk = C:\Programmi\File comuni\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Programmi\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: Alice ti aiuta.lnk = C:\Programmi\Alice ti aiuta\bin\matcli.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Programmi\Microsoft Office\Office\OSA9.EXE
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
O9 - Extra button: Create Mobile Favorite - {2EAF5BB1-070F-11D3-9307-00C04FAE2D4F} - C:\PROGRA~1\MICROS~3\INetRepl.dll
O9 - Extra button: (no name) - {2EAF5BB2-070F-11D3-9307-00C04FAE2D4F} - C:\PROGRA~1\MICROS~3\INetRepl.dll
O9 - Extra 'Tools' menuitem: Create Mobile Favorite... - {2EAF5BB2-070F-11D3-9307-00C04FAE2D4F} - C:\PROGRA~1\MICROS~3\INetRepl.dll
O9 - Extra button: Skype Plug-In - {898EA8C8-E7FF-479B-8935-AEC46303B9E5} - C:\Programmi\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O9 - Extra 'Tools' menuitem: Skype Plug-In - {898EA8C8-E7FF-479B-8935-AEC46303B9E5} - C:\Programmi\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
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
O17 - HKLM\System\CCS\Services\Tcpip\..\{9F406ED3-406B-4CBE-A05B-B7D8AA58179A}: NameServer = 85.37.17.16 85.38.28.68
O18 - Protocol: skype-ie-addon-data - {91774881-D725-4E58-B298-07617B9B86A8} - C:\Programmi\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O22 - SharedTaskScheduler: Precaricatore Browseui - {438755C2-A8BA-11D1-B96B-00A0C90312E1} - C:\WINDOWS\system32\browseui.dll
O22 - SharedTaskScheduler: Daemon di cache delle categorie di componenti - {8C7461EF-2B13-11d2-BE35-3078302C2030} - C:\WINDOWS\system32\browseui.dll
O23 - Service: Adobe LM Service - Adobe Systems - C:\Programmi\File comuni\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: Avira AntiVir Scheduler (AntiVirScheduler) - Avira GmbH - C:\Programmi\Avira\AntiVir Desktop\sched.exe
O23 - Service: Avira AntiVir Guard (AntiVirService) - Avira GmbH - C:\Programmi\Avira\AntiVir Desktop\avguard.exe
O23 - Service: Avira AntiVir WebGuard (AntiVirWebService) - Avira GmbH - C:\Programmi\Avira\AntiVir Desktop\AVWEBGRD.EXE
O23 - Service: Application Policy Service - Unknown owner - C:\WINDOWS\system32\config\systemprofile\Impostazioni locali\Dati applicazioni\Application Policy Service\svchost.exe
O23 - Service: ##Id_String1.6844F930_1628_4223_B5CC_5BB94B879762## (Bonjour Service) - Apple Computer, Inc. - C:\Programmi\Bonjour\mDNSResponder.exe
O23 - Service: C-DillaCdaC11BA - Macrovision - C:\WINDOWS\system32\drivers\CDAC11BA.EXE
O23 - Service: FLEXnet Licensing Service - Acresso Software Inc. - C:\Programmi\File comuni\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: Servizio di Google Update (gupdate) (gupdate) - Google Inc. - C:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: Servizio Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Programmi\Google\Update\GoogleUpdate.exe
O23 - Service: InstallShield Licensing Service - Macrovision - C:\Programmi\File comuni\InstallShield Shared\Service\InstallShield Licensing Service.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: Macromedia Licensing Service - Unknown owner - C:\Programmi\File comuni\Macromedia Shared\Service\Macromedia Licensing.exe
O23 - Service: McciCMService - Alcatel-Lucent - C:\Programmi\Common Files\Motive\McciCMService.exe
O23 - Service: Nero BackItUp Scheduler 4.0 - Nero AG - C:\Programmi\File comuni\Nero\Nero BackItUp 4\NBService.exe
O23 - Service: Network WanMiniport First Position - Unknown owner - C:\Programmi\Telecom Italia\WanMiniport1st\srvany.exe
O23 - Service: NVIDIA Display Driver Service (nvsvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: SwitchBoard - Adobe Systems Incorporated - C:\Programmi\File comuni\Adobe\SwitchBoard\SwitchBoard.exe

--
End of file - 12204 bytes

Ciao e benvenuto.
Chiudi tutti i programmi e disconnesso fixa ed elimina queste voci:

C:\WINDOWS\system32\config\systemprofile\Impostazioni locali\Dati applicazioni\Application Policy Service\svchost.exe
C:\WINDOWS\system32\config\systemprofile\Impostazioni locali\Dati applicazioni\Application Policy Service\svchost.exe
R3 - URLSearchHook: UrlSearchHook Class - {00000000-6E41-4FD3-8538-502F5495E5FC} - C:\Programmi\Ask.com\GenericAskToolbar.dll
R3 - URLSearchHook: ToolbarURLSearchHook Class - {CA3EB689-8F09-4026-AA10-B9534C691CE0} - C:\Programmi\Video Download DB Toolbar\tbhelper.dll
O2 - BHO: Video Download Toolbar Intercept - {B29002A0-87A1-4DC4-AC55-5982034EB61E} - C:\Programmi\VideoDownloadToolbar\VideoDownloadToolbarIntercept.dll
O2 - BHO: Ask Toolbar BHO - {D4027C7F-154A-4066-A1AD-4243D8127440} - C:\Programmi\Ask.com\GenericAskToolbar.dll
O3 - Toolbar: Video Download DB Toolbar - {338B4DFE-2E2C-4338-9E41-E176D497299E} - C:\Programmi\Video Download DB Toolbar\tbcore3.dll
O3 - Toolbar: Adobe PDF - {47833539-D0C5-4125-9FA8-0819E2EAAC93} - C:\Programmi\Adobe\Acrobat 7.0\Acrobat\AcroIEFavClient.dll
O3 - Toolbar: Ask Toolbar - {D4027C7F-154A-4066-A1AD-4243D8127440} - C:\Programmi\Ask.com\GenericAskToolbar.dll
O4 - HKLM\..\Run: [HPWS myPrintMileage Agent] C:\Programmi\Hewlett-Packard\HP Deskjet 1280\Toolbox\mpm.exe
O4 - HKLM\..\Run: [NeroCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [InCD] C:\Programmi\Ahead\InCD\InCD.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Programmi\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\File comuni\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [AdobeAAMUpdater-1.0] "C:\Programmi\File comuni\Adobe\OOBE\PDApp\UWA\UpdaterStartupUtility.exe"
O4 - HKLM\..\Run: [SwitchBoard] C:\Programmi\File comuni\Adobe\SwitchBoard\SwitchBoard.exe
O4 - HKLM\..\Run: [AdobeCS5ServiceManager] "C:\Programmi\File comuni\Adobe\CS5ServiceManager\CS5ServiceManager.exe" -launchedbylogin
O4 - HKLM\..\Run: [VMonitorVMUVC] "C:\Programmi\Vimicro Corporation\VMUVC\VMonitor.exe" VMUVC
O4 - HKLM\..\Run: [Motive SmartBridge] C:\PROGRA~1\ALICET~1\SMARTB~1\MotiveSB.exe
O4 - HKLM\..\Run: [AliceRE_McciTrayApp] C:\PROGRA~1\ALICET~1\vendors\AliceRE\content\template\DRIVEN~1\syncer\MCCITR~1.E XE
O4 - HKLM\..\Run: [Acrobat Assistant 7.0] "C:\Programmi\Adobe\Acrobat 7.0\Distillr\Acrotray.exe"
O4 - HKCU\..\Run: [MSMSGS] "C:\Programmi\Messenger\msmsgs.exe" /background
O4 - Global Startup: Adobe Acrobat Speed Launcher.lnk = ?
O4 - Global Startup: Adobe Gamma.lnk = C:\Programmi\File comuni\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Adobe Reader Speed Launch.lnk = C:\Programmi\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: Alice ti aiuta.lnk = C:\Programmi\Alice ti aiuta\bin\matcli.exe
O23 - Service: Application Policy Service - Unknown owner - C:\WINDOWS\system32\config\systemprofile\Impostazioni locali\Dati applicazioni\Application Policy Service\svchost.exe

Poi installa QUESTO programma, lo devi aggiornare e fai una scansione COMPLETA non veloce, elimina tutto quello che trova, posta il log.
Fai una pulizia con Ccleaner, compreso il Registro, sempre in Ccleaner vai in Strumenti/Ripristino Sistema seleziona tutte le voci, l'ultima non è selezionabile e quindi rimane, poi clic in basso su rimuovi.
Vai in C:\windows, cerca la cartella Prefetch e la svuoti.
Alla fine rifai una scansione con HJT e posta il nuovo log.
Fai sapere. Ciao

Il log è pulito, per quanto riguarda Avira so che gli aggiornamenti ne fa anche più di uno al giorno, prova a rimuoverlo e reinstallalo alle volte ci sono file corrotti, per Outlook non lo conosco ma potrebbe trattarsi della configurazione del programma oppure anche qui qualche file corrotto, prova ad usare un altro client di posta, vedo che usi firefox, prova thunderbird ottimo programma, se le immagini si vedono, allora dipende da Outlook.
Scarica QUESTO e lancialo riesce a riparare parecchi problemi di windows.
Se non risolvi proviamo con uno scannow, devi avere il CD di XP, fai così:
Inserisci il CD originale di XP nel lettore, lascia aperto il cassettino, poi vai in Start/Esegui e digita:
sfc /scannow dopo sfc ci vuole uno spazio, ok chiudi il cassetto del lettore, in questo modo viene fatto un controllo di tutti i file protetti di Windows, se sono intatti e originali e nel caso vengono reinstallati.
Ciao