1°:Da una decina di giorni il mio portatile non riesce più ad aprire l'H.D. esterno quando cliccando con il tasto dx cerco di aprire le proprietà, si blocca tutto e devo spegnere l'H.D. per riprendere il controllo del pc. Ho provato a collegare l'H.D. al compiuter fisso e funziona tutto regolarmente.
2°: Nello stesso periodo mi sono accorto che il portatile non trovava più neanche la stampante multifunzione.collegata tramite rete Wireless,la stessa stampante funziona correttamente tramite il PC fisso,ho provato a disinstallarla completamente e a rinstallarla,tutto OK.per la stampante ma non per lo scanner ,ma anche la stampante se spengo il portatile ,il giorno successivo nel riaccenderlo non trova più la stampante.
Ho provato con l'antivirus Avast Pro, ma non ha trovato niente.
Il mio S.O. e Windows XP, I PC un ACER Extensa 5220. Allego Log:
Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 0.46.30, on 15/02/2015
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:\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\svchost.exe
C:\Programmi\AVAST Software\Avast\AvastSvc.exe
C:\Programmi\AVAST Software\Avast\afwServ.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Programmi\Bonjour\mDNSResponder.exe
C:\WINDOWS\system32\EscSvc.exe
C:\WINDOWS\Explorer.EXE
C:\Programmi\Foxit Software\Foxit Reader\Foxit Cloud\FCUpdateService.exe
C:\Programmi\XTab\ProtectService.exe
C:\Programmi\Java\jre7\bin\jqs.exe
C:\Programmi\Google\Update\1.3.26.9\GoogleCrashHandler.exe
C:\Programmi\AVAST Software\Avast\AvastUI.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programmi\File comuni\Microsoft Shared\VS7DEBUG\mdm.exe
C:\Programmi\RealNetworks\RealDownloader\rndlresolversvc.exe
C:\Programmi\Spybot - Search & Destroy 2\SDFSSvc.exe
C:\Programmi\Spybot - Search & Destroy 2\SDUpdSvc.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\SearchIndexer.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\wbem\unsecapp.exe
C:\WINDOWS\system32\wbem\wmiapsrv.exe
C:\Programmi\Mozilla Firefox\firefox.exe
C:\Programmi\Trend Micro\HiJackThis\HiJackThis.exe
C:\WINDOWS\system32\SearchProtocolHost.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = https://www.google.com/?trackid=sp-006
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = https://www.google.com/search?trackid=sp-006&q={searchTerms}
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.google.com/?trackid=sp-006
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = https://www.google.com/?trackid=sp-006
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = https://www.google.com/search?trackid=sp-006&q={searchTerms}
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.google.com/?trackid=sp-006
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = www.google.com
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch = www.google.com
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Collegamenti
O2 - BHO: RealPlayer Download and Record Plugin for Internet Explorer - {3049C3E9-B461-4BC5-8870-4C09146192CA} - C:\Documents and Settings\All Users\Dati applicazioni\RealNetworks\RealDownloader\BrowserPlugins\IE\rndlbrowserrecordplugin.dll
O2 - BHO: Groove GFS Browser Helper - {72853161-30C5-4D22-B7F9-0BBC1D38A37E} - C:\Programmi\Microsoft Office\Office12\GrooveShellExtensions.dll
O2 - BHO: (no name) - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - (no file)
O2 - BHO: avast! Online Security - {8E5E2654-AD2D-48bf-AC2D-D17F00898D06} - C:\Programmi\AVAST Software\Avast\aswWebRepIE.dll
O2 - BHO: Easy Photo Print - {9421DD08-935F-4701-A9CA-22DF90AC4EA6} - C:\Programmi\Epson Software\Easy Photo Print\EPTBL.dll
O3 - Toolbar: Easy Photo Print - {9421DD08-935F-4701-A9CA-22DF90AC4EA6} - C:\Programmi\Epson Software\Easy Photo Print\EPTBL.dll
O4 - HKLM\..\Run: [AvastUI.exe] "C:\Programmi\AVAST Software\Avast\AvastUI.exe" /nogui
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [EPLTarget\P0000000000000000] C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_TATIIXE.EXE /EPT "EPLTarget\P0000000000000000" /M "WF-2510 Series"
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\S-1-5-18\..\Run: [Google Update] "C:\WINDOWS\system32\config\systemprofile\Impostazioni locali\Dati applicazioni\Google\Update\GoogleUpdate.exe" /c (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Restrictions present
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel present
O8 - Extra context menu item: Add to Google Photos Screensa&ver - res://C:\WINDOWS\system32\GPhotos.scr/200
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O8 - Extra context menu item: Scarica con Download &Express - C:\Programmi\Download Express\Add_Url.htm
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.5.0_16\bin\npjpi150_16.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programmi\Java\jre1.5.0_16\bin\npjpi150_16.dll
O9 - Extra button: Invia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: I&nvia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra button: Skype Click to Call - {898EA8C8-E7FF-479B-8935-AEC46303B9E5} - C:\WINDOWS\system32\shdocvw.dll
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
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://www.update.microsoft.com/microsoftupdate/v6/V5Controls/en/x86/client/muweb_site.cab?1341859798656
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/swflash.cab
O18 - Protocol: grooveLocalGWS - {88FED34C-F0CA-4636-A375-3CB6248B04CD} - C:\Programmi\Microsoft Office\Office12\GrooveSystemServices.dll
O18 - Protocol: skype-ie-addon-data - {91774881-D725-4E58-B298-07617B9B86A8} - (no file)
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FILECO~1\Skype\SKYPE4~1.DLL
O20 - Winlogon Notify: SDWinLogon - SDWinLogon.dll (file missing)
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 Flash Player Update Service (AdobeFlashPlayerUpdateSvc) - Adobe Systems Incorporated - C:\WINDOWS\system32\Macromed\Flash\FlashPlayerUpdateService.exe
O23 - Service: avast! Antivirus - AVAST Software - C:\Programmi\AVAST Software\Avast\AvastSvc.exe
O23 - Service: avast! Firewall - AVAST Software - C:\Programmi\AVAST Software\Avast\afwServ.exe
O23 - Service: Servizio Bonjour (Bonjour Service) - Apple Inc. - C:\Programmi\Bonjour\mDNSResponder.exe
O23 - Service: Epson Scanner Service (EpsonScanSvc) - Seiko Epson Corporation - C:\WINDOWS\system32\EscSvc.exe
O23 - Service: Foxit Cloud Safe Update Service (FoxitCloudUpdateService) - Foxit Corporation - C:\Programmi\Foxit Software\Foxit Reader\Foxit Cloud\FCUpdateService.exe
O23 - Service: Servizio 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: Google Software Updater (gusvc) - Google - C:\Programmi\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programmi\File comuni\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: IHProtect Service - XTab system - C:\Programmi\XTab\ProtectService.exe
O23 - Service: Servizio iPod (iPod Service) - Apple Inc. - C:\Programmi\iPod\bin\iPodService.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Oracle Corporation - C:\Programmi\Java\jre7\bin\jqs.exe
O23 - Service: MBAMService - Malwarebytes Corporation - C:\Programmi\Malwarebytes Anti-Malware\mbamservice.exe
O23 - Service: Mozilla Maintenance Service (MozillaMaintenance) - Mozilla Foundation - C:\Programmi\Mozilla Maintenance Service\maintenanceservice.exe
O23 - Service: RealNetworks Downloader Resolver Service - Unknown owner - C:\Programmi\RealNetworks\RealDownloader\rndlresolversvc.exe
O23 - Service: Spybot-S&D 2 Scanner Service (SDScannerService) - Safer-Networking Ltd. - C:\Programmi\Spybot - Search & Destroy 2\SDFSSvc.exe
O23 - Service: Spybot-S&D 2 Updating Service (SDUpdateService) - Safer-Networking Ltd. - C:\Programmi\Spybot - Search & Destroy 2\SDUpdSvc.exe
O23 - Service: Spybot-S&D 2 Security Center Service (SDWSCService) - Safer-Networking Ltd. - C:\Programmi\Spybot - Search & Destroy 2\SDWSCSvc.exe
O23 - Service: Skype Updater (SkypeUpdate) - Skype Technologies - C:\Programmi\Skype\Updater\Updater.exe

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Rimango in attesa di un aiuto,grazie