Salve a tutti, invio il mio logfile del mio pc portatile windows 8.
Sono parecchi giorni che il pc ogni volta che apro google chrome avast mi apre un virus soprannominato "butter surfers" e adesso va anche lento.
grazie in anticipo.
Massimo

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 11:05:17, on 09/07/2016
Platform: Unknown Windows (WinNT 6.02.1008)
MSIE: Internet Explorer v11.0 (11.00.9600.18123)
Boot mode: Normal

Running processes:
C:\Program Files (x86)\Launch Manager\LManager.exe
C:\Users\maurizio\AppData\Local\Akamai\netsession_win.exe
C:\Program Files\Lexmark\ErrorApp\lmab1err.exe
C:\Program Files (x86)\NTI\Acer Backup Manager\BackupManagerTray.exe
C:\Users\maurizio\AppData\Local\Akamai\netsession_win.exe
C:\Program Files (x86)\iTunes\iTunesHelper.exe
C:\Program Files (x86)\CyberLink\MediaEspresso\DeviceDetector\DeviceDetector.exe
C:\Program Files\Acer\Acer Instant Service\InstantUpdate\iuEmailOutlookAgent.exe
C:\Program Files\Acer\Acer Instant Service\InstantUpdate\iuBrowserIEAgent.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Users\maurizio\Documents\Protezione Mauri\HiJackThis.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 = http://www.google.it/
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 =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page = C:\Windows\SysWOW64\blank.htm
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local;<local>
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
F2 - REG:system.ini: UserInit=userinit.exe,
O2 - BHO: Skype for Business Click to Call BHO - {31D09BA0-12F5-4CCE-BE8A-2923E76605DA} - C:\Program Files (x86)\Microsoft Office\Office15\OCHelper.dll
O2 - BHO: avast! Online Security - {8E5E2654-AD2D-48bf-AC2D-D17F00898D06} - C:\Program Files\AVAST Software\Avast\aswWebRepIE.dll
O2 - BHO: Advanced SystemCare Browser Protection - {BA0C978D-D909-49B6-AFE2-8BDE245DC7E6} - C:\PROGRA~2\IObit\ADVANC~1\BROWER~1\ASCPLU~1.DLL
O2 - BHO: Microsoft SkyDrive Pro Browser Helper - {D0498E0A-45B7-42AE-A9AA-ABA463DBD3BF} - C:\PROGRA~2\Microsoft Office\Office15\GROOVEEX.DLL
O4 - HKLM\..\Run: [RadioController] "C:\Program Files (x86)\RadioController\RfBtnHelper.exe" Start_Run
O4 - HKLM\..\Run: [Dolby Home Theater v4] "C:\Dolby PCEE4\pcee4.exe" -autostart
O4 - HKLM\..\Run: [APSDaemon] "C:\Program Files (x86)\Common Files\Apple\Apple Application Support\APSDaemon.exe"
O4 - HKLM\..\Run: [AvastUI.exe] "C:\Program Files\AVAST Software\Avast\AvastUI.exe" /nogui
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files (x86)\iTunes\iTunesHelper.exe"
O4 - HKCU\..\Run: [ApplePhotoStreams] C:\Program Files (x86)\Common Files\Apple\Internet Services\ApplePhotoStreams.exe
O4 - HKCU\..\Run: [com.apple.dav.bookmarks.daemon] C:\Program Files (x86)\Common Files\Apple\Internet Services\BookmarkDAV_client.exe
O4 - HKCU\..\Run: [Facebook Update] "C:\Users\maurizio\AppData\Local\Facebook\Update\FacebookUpdate.exe" /c /nocrashserver
O4 - HKCU\..\Run: [Akamai NetSession Interface] "C:\Users\maurizio\AppData\Local\Akamai\netsession_win.exe"
O4 - HKCU\..\Run: [GUDelayStartup] "C:\Program Files (x86)\Glary Utilities 5\StartupManager.exe" -delayrun
O4 - HKCU\..\Run: [CCleaner Monitoring] "C:\Program Files\CCleaner\CCleaner64.exe" /MONITOR
O4 - HKCU\..\Run: [LMab1err] C:\Program Files\Lexmark\ErrorApp\LMab1err.exe
O4 - Global Startup: Acer Backup Manager Tray.lnk = C:\Program Files (x86)\NTI\Acer Backup Manager\BackupManagerTray.exe
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\Program Files\Microsoft Office 15\Root\Office15\EXCEL.EXE/3000
O8 - Extra context menu item: Se&nd to OneNote - res://C:\Program Files\Microsoft Office 15\Root\Office15\ONBttnIE.dll/105
O9 - Extra button: Invia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\Program Files (x86)\Microsoft Office\Office15\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: I&nvia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\Program Files (x86)\Microsoft Office\Office15\ONBttnIE.dll
O9 - Extra button: Lync - Chiamata con un clic - {31D09BA0-12F5-4CCE-BE8A-2923E76605DA} - C:\Program Files (x86)\Microsoft Office\Office15\OCHelper.dll
O9 - Extra 'Tools' menuitem: Lync - Chiamata con un clic - {31D09BA0-12F5-4CCE-BE8A-2923E76605DA} - C:\Program Files (x86)\Microsoft Office\Office15\OCHelper.dll
O9 - Extra button: &Note collegate di OneNote - {789FE86F-6FC4-46A1-9849-EDE0DB0C95CA} - C:\Program Files (x86)\Microsoft Office\Office15\ONBttnIELinkedNotes.dll
O9 - Extra 'Tools' menuitem: &Note collegate di OneNote - {789FE86F-6FC4-46A1-9849-EDE0DB0C95CA} - C:\Program Files (x86)\Microsoft Office\Office15\ONBttnIELinkedNotes.dll
O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics
O18 - Protocol: osf - {D924BDC6-C83A-4BD5-90D0-095128A113D1} - C:\Program Files (x86)\Microsoft Office\Office15\MSOSB.DLL
O18 - Filter hijack: text/xml - {807583E5-5146-11D5-A672-00B0D022E945} - C:\Program Files (x86)\Common Files\Microsoft Shared\OFFICE15\MSOXMLMF.DLL
O23 - Service: SAS Core Service (!SASCORE) - SUPERAntiSpyware.com - C:\Program Files\SUPERAntiSpyware\SASCORE64.EXE
O23 - Service: Advanced SystemCare Service 6 (AdvancedSystemCareService6) - IObit - C:\Program Files (x86)\IObit\Advanced SystemCare 6\ASCService.exe
O23 - Service: @%SystemRoot%\system32\Alg.exe,-112 (ALG) - Unknown owner - C:\WINDOWS\System32\alg.exe (file missing)
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files (x86)\Common Files\Apple\Mobile Device Support\AppleMobileDeviceService.exe
O23 - Service: AtherosSvc - Qualcomm Atheros Commnucations - C:\Program Files (x86)\Bluetooth Suite\adminservice.exe
O23 - Service: Avast Antivirus (avast! Antivirus) - AVAST Software - C:\Program Files\AVAST Software\Avast\AvastSvc.exe
O23 - Service: avast! Firewall - AVAST Software - C:\Program Files\AVAST Software\Avast\afwServ.exe
O23 - Service: AvastVBox COM Service (AvastVBoxSvc) - Avast Software - C:\Program Files\AVAST Software\Avast\ng\vbox\AvastVBoxSVC.exe
O23 - Service: Servizio Bonjour (Bonjour Service) - Apple Inc. - C:\Program Files\Bonjour\mDNSResponder.exe
O23 - Service: Broadcom Card Reader Service (BrcmCardReader) - Broadcom Corp. - C:\Program Files\Broadcom\MemoryCard\BrcmCardReader.exe
O23 - Service: CCDMonitorService - Acer Incorporated - C:\Program Files (x86)\Acer\Acer Cloud\CCDMonitorService.exe
O23 - Service: Intel(R) Content Protection HECI Service (cphs) - Intel Corporation - C:\WINDOWS\SysWow64\IntelCpHeciSvc.exe
O23 - Service: Device Fast-lane Service (DeviceFastLaneService) - Acer Incorporated - C:\Program Files\Acer\Acer Device Fast-lane\DeviceFastLaneSvc.exe
O23 - Service: Dritek WMI Service (DsiWMIService) - Dritek System Inc. - C:\Program Files (x86)\Launch Manager\dsiwmis.exe
O23 - Service: @%SystemRoot%\system32\efssvc.dll,-100 (EFS) - Unknown owner - C:\WINDOWS\System32\lsass.exe (file missing)
O23 - Service: ePower Service (ePowerSvc) - Acer Incorporated - C:\Program Files\Acer\Acer Power Management\ePowerSvc.exe
O23 - Service: @%systemroot%\system32\fxsresm.dll,-118 (Fax) - Unknown owner - C:\WINDOWS\system32\fxssvc.exe (file missing)
O23 - Service: FLEXnet Licensing Service - Acresso Software Inc. - C:\Program Files (x86)\Common Files\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: GamesAppService - WildTangent, Inc. - C:\Program Files (x86)\WildTangent Games\App\GamesAppService.exe
O23 - Service: Servizio Google Update (gupdate) (gupdate) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: Servizio Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: @%SystemRoot%\system32\ieetwcollectorres.dll,-1000 (IEEtwCollectorService) - Unknown owner - C:\WINDOWS\system32\IEEtwCollector.exe (file missing)
O23 - Service: Intel(R) Capability Licensing Service Interface - Intel(R) Corporation - C:\Program Files\Intel\iCLS Client\HeciServer.exe
O23 - Service: Servizio iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Intel(R) Dynamic Application Loader Host Interface Service (jhi_service) - Intel Corporation - C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL\jhi_service.exe
O23 - Service: @keyiso.dll,-100 (KeyIso) - Unknown owner - C:\WINDOWS\system32\lsass.exe (file missing)
O23 - Service: lmab_device - - C:\WINDOWS\system32\LMabcoms.exe
O23 - Service: Intel(R) Management and Security Application Local Management Service (LMS) - Intel Corporation - C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\LMS\LMS.exe
O23 - Service: @comres.dll,-2797 (MSDTC) - Unknown owner - C:\WINDOWS\System32\msdtc.exe (file missing)
O23 - Service: NTI IScheduleSvc - NTI Corporation - C:\Program Files (x86)\NTI\Acer Backup Manager\IScheduleSvc.exe
O23 - Service: NVIDIA Display Driver Service (nvsvc) - Unknown owner - C:\WINDOWS\system32\nvvsvc.exe (file missing)
O23 - Service: NVIDIA Update Service Daemon (nvUpdatusService) - NVIDIA Corporation - C:\Program Files (x86)\NVIDIA Corporation\NVIDIA Update Core\daemonu.exe
O23 - Service: Dritek RF Button Command Service (RfButtonDriverService) - Dritek System INC. - C:\Windows\RfBtnSvc64.exe
O23 - Service: @%systemroot%\system32\Locator.exe,-2 (RpcLocator) - Unknown owner - C:\WINDOWS\system32\locator.exe (file missing)
O23 - Service: @%SystemRoot%\system32\samsrv.dll,-1 (SamSs) - Unknown owner - C:\WINDOWS\system32\lsass.exe (file missing)
O23 - Service: @%systemroot%\system32\spoolsv.exe,-1 (Spooler) - Unknown owner - C:\WINDOWS\System32\spoolsv.exe (file missing)
O23 - Service: @%SystemRoot%\system32\sppsvc.exe,-101 (sppsvc) - Unknown owner - C:\WINDOWS\system32\sppsvc.exe (file missing)
O23 - Service: SpyHunter 4 Service - Enigma Software Group USA, LLC. - C:\Program Files\Enigma Software Group\SpyHunter\SH4Service.exe
O23 - Service: TeamViewer 9 (TeamViewer9) - TeamViewer GmbH - C:\Program Files (x86)\TeamViewer\Version9\TeamViewer_Service.exe
O23 - Service: @%SystemRoot%\system32\ui0detect.exe,-101 (UI0Detect) - Unknown owner - C:\WINDOWS\system32\UI0Detect.exe (file missing)
O23 - Service: Intel(R) Management and Security Application User Notification Service (UNS) - Intel Corporation - C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\UNS\UNS.exe
O23 - Service: @%SystemRoot%\system32\vaultsvc.dll,-1003 (VaultSvc) - Unknown owner - C:\WINDOWS\system32\lsass.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vds.exe,-100 (vds) - Unknown owner - C:\WINDOWS\System32\vds.exe (file missing)
O23 - Service: @%systemroot%\system32\vssvc.exe,-102 (VSS) - Unknown owner - C:\WINDOWS\system32\vssvc.exe (file missing)
O23 - Service: @%systemroot%\system32\wbengine.exe,-104 (wbengine) - Unknown owner - C:\WINDOWS\system32\wbengine.exe (file missing)
O23 - Service: @%ProgramFiles%\Windows Defender\MpAsDesc.dll,-320 (WdNisSvc) - Unknown owner - C:\Program Files (x86)\Windows Defender\NisSrv.exe (file missing)
O23 - Service: @%ProgramFiles%\Windows Defender\MpAsDesc.dll,-310 (WinDefend) - Unknown owner - C:\Program Files (x86)\Windows Defender\MsMpEng.exe (file missing)
O23 - Service: @%Systemroot%\system32\wbem\wmiapsrv.exe,-110 (wmiApSrv) - Unknown owner - C:\WINDOWS\system32\wbem\WmiApSrv.exe (file missing)
O23 - Service: @%PROGRAMFILES%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown owner - C:\Program Files (x86)\Windows Media Player\wmpnetwk.exe (file missing)
O23 - Service: ZAtheros Wlan Agent - Atheros - C:\Program Files (x86)\Qualcomm Atheros\Ath_WlanAgent.exe

--
End of file - 12380 bytes

aggiorna hijackthis e riposta il log ( vedi sof in aiutamici )
....... CANCELLA ALTRO POST UGUALE - DOPPIONE - grazie

.... domanda ..... scarichi normalmente gli aggiornamenti win update ?

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Dopo aver fatto quanto suggerito da wolfe, ci sono delle voci da eliminare in HJT.
Chiudi tutti i programmi e disconnesso da internet,
Lancia HijackThis e clicca sul secondo pulsante Do a system scan only
inserisci il segno di spunta nel quadratino davanti alle righe sotto elencate, una volta seleziona clicca il tasto Fix checked per procedere all'eliminazione, comparirà una finestra clicca su SI per accettare e l'operazione è conclusa.

Ti preciso che eliminando le voci 04, i programmi non vengono toccati ma viene solo disattivato l'Avvio automatico, inutile......basterebbe solo l'antivirus.
Ricorda che Hijackthis deve essere avviato da una cartella a lui dedicata sul desktop. Solo così Hijackthis creerà copie di backup di quello che viene eliminato prima di apportare modifiche, così in caso di inconvenienti si possono reinstallare.

R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local;
O4 - HKLM\..\Run: [RadioController] "C:\Program Files (x86)\RadioController\RfBtnHelper.exe" Start_Run
O4 - HKLM\..\Run: [Dolby Home Theater v4] "C:\Dolby PCEE4\pcee4.exe" -autostart
O4 - HKLM\..\Run: [APSDaemon] "C:\Program Files (x86)\Common Files\Apple\Apple Application Support\APSDaemon.exe"
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files (x86)\iTunes\iTunesHelper.exe"
O4 - HKCU\..\Run: [ApplePhotoStreams] C:\Program Files (x86)\Common Files\Apple\Internet Services\ApplePhotoStreams.exe
O4 - HKCU\..\Run: [com.apple.dav.bookmarks.daemon] C:\Program Files (x86)\Common Files\Apple\Internet Services\BookmarkDAV_client.exe
O4 - HKCU\..\Run: [Facebook Update] "C:\Users\maurizio\AppData\Local\Facebook\Update\FacebookUpdate.exe" /c /nocrashserver
O4 - HKCU\..\Run: [Akamai NetSession Interface] "C:\Users\maurizio\AppData\Local\Akamai\netsession_win.exe"
O4 - HKCU\..\Run: [GUDelayStartup] "C:\Program Files (x86)\Glary Utilities 5\StartupManager.exe" -delayrun
O4 - HKCU\..\Run: [CCleaner Monitoring] "C:\Program Files\CCleaner\CCleaner64.exe" /MONITOR
O4 - HKCU\..\Run: [LMab1err] C:\Program Files\Lexmark\ErrorApp\LMab1err.exe
O4 - Global Startup: Acer Backup Manager Tray.lnk = C:\Program Files (x86)\NTI\Acer Backup Manager\BackupManagerTray.exe
Alla fine pulizia con Ccleaner compreso il Registro.
Controlla se la pagina iniziale del browser è stata modificata, guarda anche fra i motori di ricerca se c'è qualche motore sconosciuto ed elimina, tieni solo Google.
Fai sapere come va il pc.