Buona domenica a tutti.
Facendo una scansione l'antivirus mi ha trovato delle bestioline che ho messo in quarantena. Ho provveduto a fare una nuova scansione in modalità provvisoria e pur non trovando nulla presentava quanto vorrete leggere nella immagine allegata.
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Non capisco cosa si intende per firma digitale danneggiata e file bloccato Non verificato e chiedo lumi come riparare e come far controllare anche i file bloccati.
Allego anche un log di Hijackthis per un controllo.

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 8.48.55, on 21/08/2011
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
Boot mode: Normal

Running processes:
C:\WINDOWS\System32\smss.exe
C:\PROGRA~1\AVG\AVG10\avgchsvx.exe
C:\PROGRA~1\AVG\AVG10\avgrsx.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\Programmi\USB Safely Remove\USBSRService.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
c:\programmi\file comuni\logishrd\lvmvfm\LVPrcSrv.exe
C:\Programmi\Creative\Shared Files\CTAudSvc.exe
C:\Programmi\Panda USB Vaccine\USBVaccine.exe
C:\WINDOWS\system32\rundll32.exe
C:\Programmi\File comuni\Java\Java Update\jusched.exe
C:\Programmi\Panasonic\Device Monitor\dmwakeup.exe
C:\Programmi\Panasonic\MFStation\PCCMFSDM.exe
C:\Programmi\VMware\VMware Player\hqtray.exe
C:\Programmi\Creative\SBAudigy2ZS\DVDAudio\CTDVDDet.EXE
C:\Programmi\File comuni\LogiShrd\LComMgr\Communications_Helper.exe
C:\Programmi\ATI Technologies\ATI.ACE\Core-Static\MOM.exe
C:\Programmi\Adobe\Reader 9.0\Reader\Reader_sl.exe
C:\Programmi\AVG\AVG10\avgtray.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\Creative\MediaSource\RemoteControl\RCMan.EXE
C:\Programmi\USB Safely Remove\USBSafelyRemove.exe
C:\Programmi\File comuni\LogiShrd\LComMgr\LVComSX.exe
C:\Programmi\AVG\AVG10\avgwdsvc.exe
C:\Programmi\ATI Technologies\ATI.ACE\Core-Static\ccc.exe
C:\Programmi\AVG\AVG10\Identity Protection\agent\bin\avgidsmonitor.exe
C:\WINDOWS\system32\CTsvcCDA.exe
C:\Programmi\Java\jre6\bin\jqs.exe
C:\Programmi\File comuni\Logishrd\LQCVFX\COCIManager.exe
C:\Programmi\File comuni\Microsoft Shared\VS7DEBUG\mdm.exe
C:\Programmi\Nero\Nero8\Nero BackItUp\NBService.exe
C:\WINDOWS\system32\svchost.exe
C:\Programmi\AVG\AVG10\avgnsx.exe
C:\Programmi\Common Files\VMware\USB\vmware-usbarbitrator.exe
C:\WINDOWS\system32\vmnat.exe
C:\Programmi\VIA\RAID\vialogsv.exe
C:\WINDOWS\system32\MsPMSPSv.exe
C:\WINDOWS\system32\vmnetdhcp.exe
C:\Programmi\VMware\VMware Player\vmware-authd.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Programmi\AVG\AVG10\Identity Protection\Agent\Bin\AVGIDSAgent.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Programmi\Internet Explorer\iexplore.exe
C:\Documents and Settings\Agostino\Desktop\HujackThis e Backups\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.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,CustomizeSearch =
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://windowsupdate.microsoft.com/
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = localhost
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: WormRadar.com IESiteBlocker.NavFilter - {3CA2F312-6F6E-4B53-A66E-4E65E497C8C0} - C:\Programmi\AVG\AVG10\avgssie.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
O4 - HKLM\..\Run: [BluetoothAuthenticationAgent] rundll32.exe bthprops.cpl,,BluetoothAuthenticationAgent
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programmi\File comuni\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [Panasonic Device Monitor Wakeup] C:\Programmi\Panasonic\Device Monitor\dmwakeup.exe
O4 - HKLM\..\Run: [Panasonic Device Manager for Multi-Function Station software] C:\Programmi\Panasonic\MFStation\PCCMFSDM.exe
O4 - HKLM\..\Run: [LogitechQuickCamRibbon] "C:\Programmi\Logitech\QuickCam10\QuickCam10.exe" /hide
O4 - HKLM\..\Run: [VMware hqtray] "C:\Programmi\VMware\VMware Player\hqtray.exe"
O4 - HKLM\..\Run: [CTDVDDET] C:\Programmi\Creative\SBAudigy2ZS\DVDAudio\CTDVDDet.EXE
O4 - HKLM\..\Run: [LogitechCommunicationsManager] "C:\Programmi\File comuni\LogiShrd\LComMgr\Communications_Helper.exe"
O4 - HKLM\..\Run: [StartCCC] "C:\Programmi\ATI Technologies\ATI.ACE\Core-Static\CLIStart.exe" MSRun
O4 - HKLM\..\Run: [Adobe ARM] "C:\Programmi\File comuni\Adobe\ARM\1.0\AdobeARM.exe"
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Programmi\Adobe\Reader 9.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [AVG_TRAY] C:\Programmi\AVG\AVG10\avgtray.exe
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [RemoteCenter] C:\Programmi\Creative\MediaSource\RemoteControl\RCMan.EXE
O4 - HKCU\..\Run: [USB Safely Remove] C:\Programmi\USB Safely Remove\USBSafelyRemove.exe /startup
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-19\..\RunOnce: [nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-20\..\RunOnce: [nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\S-1-5-18\..\RunOnce: [nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - HKUS\.DEFAULT\..\RunOnce: [nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'Default user')
O4 - Startup: StartupFaster
O8 - Extra context menu item: Scarica con Download &Express - C:\Programmi\Download Express\Add_Url.htm
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\Office12\REFIEBAR.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:\WINDOWS\system32\shdocvw.dll
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\WINDOWS\system32\shdocvw.dll
O10 - Unknown file in Winsock LSP: c:\programmi\vmware\vmware player\vsocklib.dll
O10 - Unknown file in Winsock LSP: c:\programmi\vmware\vmware player\vsocklib.dll
O16 - DPF: {644E432F-49D3-41A1-8DD5-E099162EEEC5} (Symantec RuFSI Utility Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/swflash.cab
O16 - DPF: {D4B68B83-8710-488B-A692-D74B50BA558E} (Creative Software AutoUpdate Support Package 2) - http://ccfiles.creative.com/Web/softwareupdate/ocx/15113/CTPIDPDE.cab
O18 - Protocol: linkscanner - {F274614C-63F8-47D5-A4D1-FBDDE494F8D1} - C:\Programmi\AVG\AVG10\avgpp.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: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.exe
O23 - Service: AVGIDSAgent - AVG Technologies CZ, s.r.o. - C:\Programmi\AVG\AVG10\Identity Protection\Agent\Bin\AVGIDSAgent.exe
O23 - Service: AVG WatchDog (avgwd) - AVG Technologies CZ, s.r.o. - C:\Programmi\AVG\AVG10\avgwdsvc.exe
O23 - Service: Creative Audio Engine Licensing Service - Creative Labs - C:\Programmi\File comuni\Creative Labs Shared\Service\CTAELicensing.exe
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\system32\CTsvcCDA.exe
O23 - Service: Creative Audio Service (CTAudSvcService) - Creative Technology Ltd - C:\Programmi\Creative\Shared Files\CTAudSvc.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Programmi\Java\jre6\bin\jqs.exe
O23 - Service: Process Monitor (LVPrcSrv) - Logitech Inc. - c:\programmi\file comuni\logishrd\lvmvfm\LVPrcSrv.exe
O23 - Service: LVSrvLauncher - Logitech Inc. - C:\Programmi\File comuni\LogiShrd\SrvLnch\SrvLnch.exe
O23 - Service: Nero BackItUp Scheduler 3 - Nero AG - C:\Programmi\Nero\Nero8\Nero BackItUp\NBService.exe
O23 - Service: NMIndexingService - Nero AG - C:\Programmi\File comuni\Nero\Lib\NMIndexingService.exe
O23 - Service: VMware Agent Service (ufad-ws60) - VMware, Inc. - C:\Programmi\VMware\VMware Player\vmware-ufad.exe
O23 - Service: USB Safely Remove Assistant (USBSafelyRemoveService) - Unknown owner - C:\Programmi\USB Safely Remove\USBSRService.exe
O23 - Service: VMware Authorization Service (VMAuthdService) - VMware, Inc. - C:\Programmi\VMware\VMware Player\vmware-authd.exe
O23 - Service: VMware DHCP Service (VMnetDHCP) - VMware, Inc. - C:\WINDOWS\system32\vmnetdhcp.exe
O23 - Service: VMware USB Arbitration Service (VMUSBArbService) - VMware, Inc. - C:\Programmi\Common Files\VMware\USB\vmware-usbarbitrator.exe
O23 - Service: VMware NAT Service - VMware, Inc. - C:\WINDOWS\system32\vmnat.exe
O23 - Service: VRAID Log Service - Unknown owner - C:\Programmi\VIA\RAID\vialogsv.exe

--
End of file - 10313 bytes

Grazie anticipate e salutoni.

Si intende che quel programma/SW è riconosciuto dalla Microsoft in fase di installazione. Ci sono però tantissimi programmi/SW non riconosciuti ma, se si conosce la fonte, si possono tranquillamente installare. Personalmente mi capita spesso di installare simili programmi e non ho mai avuto problemi.
Il resto del log, mi dispiace, lo devo lasciare a quelli "bravi".