Ciao a tutti,
qualcuno mi saprebbe dire se da HijackThis
tutti quei programma che carica, in particolare
da "service", posso eliminare tutti quelli dove
vedo nel rigo "file missing"? saranno una ventina!

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 12:25:31, on 15/02/2016
Platform: Unknown Windows (WinNT 6.01.3505 SP1)
MSIE: Internet Explorer v11.0 (11.00.9600.18163)
Boot mode: Normal

Running processes:
C:\PRG-2\Smart Defrag 3\SmartDefrag.exe
C:\Program Files (x86)\Common Files\Acronis\Schedule2\schedhlp.exe
C:\Program Files (x86)\NVIDIA Corporation\Update Core\NvBackend.exe
C:\Program Files (x86)\Common Files\Nero\Lib\NMBgMonitor.exe
C:\Program Files (x86)\Acronis\TrueImageHome\TrueImageMonitor.exe
C:\Program Files (x86)\Acronis\OnlineBackupStandalone\TrueImageMonitor.exe
C:\Program Files (x86)\HP\HP Software Update\hpwuschd2.exe
C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe
C:\Program Files (x86)\Common Files\Nero\Lib\NMIndexStoreSvr.exe
C:\Program Files (x86)\Kaspersky Lab\Kaspersky Internet Security 16.0.0\avpui.exe
C:\PRG-2\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 = https://www.google.it/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/p/?LinkId=255141
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/p/?LinkId=255141
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
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
F2 - REG:system.ini: UserInit=userinit.exe,
O2 - BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files (x86)\Java\jre1.8.0_66\bin\ssv.dll
O2 - BHO: IESpeakDoc - {8D10F6C4-0E01-4BD4-8601-11AC1FDF8126} - C:\Program Files (x86)\Bluetooth Suite\IEPlugIn.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - C:\Program Files (x86)\Google\Google Toolbar\GoogleToolbar_32.dll
O2 - BHO: Logitech SetPoint - {AF949550-9094-4807-95EC-D1C317803333} - C:\Program Files\Logitech\SetPointP\32-bit\SetPointSmooth.dll
O2 - BHO: ScriptInjectionPluginBrowserHelperObject - {C66D064F-82FE-4E1A-B06A-B2490BA48B18} - C:\Program Files (x86)\Kaspersky Lab\Kaspersky Internet Security 16.0.0\IEExt\ie_plugin.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files (x86)\Java\jre1.8.0_66\bin\jp2ssv.dll
O3 - Toolbar: Kaspersky Protection toolbar - {3507FA00-ADA2-4A02-99B9-51AD26CA9120} - C:\Program Files (x86)\Kaspersky Lab\Kaspersky Internet Security 16.0.0\IEExt\ie_plugin.dll
O3 - Toolbar: Google Toolbar - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - C:\Program Files (x86)\Google\Google Toolbar\GoogleToolbar_32.dll
O4 - HKLM\..\Run: [TrueImageMonitor.exe] "C:\Program Files (x86)\Acronis\TrueImageHome\TrueImageMonitor.exe"
O4 - HKLM\..\Run: [SAOB Monitor] C:\Program Files (x86)\Acronis\OnlineBackupStandalone\TrueImageMonitor.exe
O4 - HKLM\..\Run: [NBKeyScan] "C:\Program Files (x86)\Nero\Nero8\Nero BackItUp\NBKeyScan.exe"
O4 - HKLM\..\Run: [APSDaemon] "C:\Program Files (x86)\Common Files\Apple\Apple Application Support\APSDaemon.exe"
O4 - HKLM\..\Run: [HP Software Update] C:\Program Files (x86)\Hp\HP Software Update\HPWuSchd2.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe"
O4 - HKCU\..\Run: [Google Update] "C:\Users\Gabriele\AppData\Local\Google\Update\GoogleUpdate.exe" /c
O4 - HKCU\..\Run: [BgMonitor_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "C:\Program Files (x86)\Common Files\Nero\Lib\NMBgMonitor.exe"
O4 - HKUS\S-1-5-19\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-19\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'SERVIZIO LOCALE')
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'SERVIZIO DI RETE')
O4 - HKUS\S-1-5-20\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'SERVIZIO DI RETE')
O4 - Startup: Monitora avvisi inchiostro - .lnk = ?
O4 - Startup: Monitora avvisi inchiostro - HP Officejet 4630 series.lnk = ?
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~2\MICROS~1\Office12\EXCEL.EXE/3000
O9 - Extra button: HP Smart Print - {22CC3EBD-C286-43aa-B8E6-06B115F74162} - C:\Program Files (x86)\Hewlett-Packard\Smart Print\SmartPrintSetup.exe
O9 - Extra 'Tools' menuitem: HP Smart Print - {22CC3EBD-C286-43aa-B8E6-06B115F74162} - C:\Program Files (x86)\Hewlett-Packard\Smart Print\SmartPrintSetup.exe
O9 - Extra button: (no name) - {7815BE26-237D-41A8-A98F-F7BD75F71086} - C:\Program Files (x86)\Bluetooth Suite\IEPlugIn.dll
O9 - Extra 'Tools' menuitem: Send by Bluetooth to - {7815BE26-237D-41A8-A98F-F7BD75F71086} - C:\Program Files (x86)\Bluetooth Suite\IEPlugIn.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~2\MICROS~1\Office12\REFIEBAR.DLL
O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics
O13 - Gopher Prefix:
O23 - Service: Servizio Acronis Scheduler2 (AcrSch2Svc) - Acronis - C:\Program Files (x86)\Common Files\Acronis\Schedule2\schedul2.exe
O23 - Service: Adobe Acrobat Update Service (AdobeARMservice) - Adobe Systems Incorporated - C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\armsvc.exe
O23 - Service: Adobe Flash Player Update Service (AdobeFlashPlayerUpdateSvc) - Adobe Systems Incorporated - C:\Windows\SysWOW64\Macromed\Flash\FlashPlayerUpdateService.exe
O23 - Service: Servizio Acronis Nonstop Backup (afcdpsrv) - Acronis - C:\Program Files (x86)\Common Files\Acronis\CDP\afcdpsrv.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 - Atheros Commnucations - C:\Program Files (x86)\Bluetooth Suite\adminservice.exe
O23 - Service: Servizio Kaspersky Anti-Virus 16.0.0 (AVP16.0.0) - Kaspersky Lab ZAO - C:\Program Files (x86)\Kaspersky Lab\Kaspersky Internet Security 16.0.0\avp.exe
O23 - Service: Servizio Bonjour (Bonjour Service) - Apple Inc. - C:\Program Files\Bonjour\mDNSResponder.exe
O23 - Service: @%SystemRoot%\system32\efssvc.dll,-100 (EFS) - Unknown owner - C:\Windows\System32\lsass.exe (file missing)
O23 - Service: @%systemroot%\system32\fxsresm.dll,-118 (Fax) - Unknown owner - C:\Windows\system32\fxssvc.exe (file missing)
O23 - Service: NVIDIA GeForce Experience Service (GfExperienceService) - NVIDIA Corporation - C:\Program Files\NVIDIA Corporation\GeForce Experience Service\GfExperienceService.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: Google Software Updater (gusvc) - Google - C:\Program Files (x86)\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: @%SystemRoot%\system32\ieetwcollectorres.dll,-1000 (IEEtwCollectorService) - Unknown owner - C:\Windows\system32\IEEtwCollector.exe (file missing)
O23 - Service: @keyiso.dll,-100 (KeyIso) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: Logitech Bluetooth Service (LBTServ) - Logitech, Inc. - C:\Program Files\Common Files\LogiShrd\Bluetooth\lbtserv.exe
O23 - Service: LiveUpdate (LiveUpdateSvc) - IObit - C:\Program Files (x86)\IObit\LiveUpdate\LiveUpdate.exe
O23 - Service: MBAMService - Malwarebytes Corporation - C:\PRG-2\Malwarebytes Anti-Malware\mbamservice.exe
O23 - Service: @comres.dll,-2797 (MSDTC) - Unknown owner - C:\Windows\System32\msdtc.exe (file missing)
O23 - Service: Nero BackItUp Scheduler 3 - Nero AG - C:\Program Files (x86)\Nero\Nero8\Nero BackItUp\NBService.exe
O23 - Service: @%SystemRoot%\System32\netlogon.dll,-102 (Netlogon) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: NMIndexingService - Nero AG - C:\Program Files (x86)\Common Files\Nero\Lib\NMIndexingService.exe
O23 - Service: NVIDIA Network Service (NvNetworkService) - NVIDIA Corporation - C:\Program Files (x86)\NVIDIA Corporation\NetService\NvNetworkService.exe
O23 - Service: NVIDIA Streamer Service (NvStreamSvc) - NVIDIA Corporation - C:\Program Files\NVIDIA Corporation\NvStreamSrv\nvstreamsvc.exe
O23 - Service: NVIDIA Display Driver Service (nvsvc) - Unknown owner - C:\Windows\system32\nvvsvc.exe (file missing)
O23 - Service: @%systemroot%\system32\psbase.dll,-300 (ProtectedStorage) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
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: ServiceLayer - Nokia - C:\Program Files (x86)\PC Connectivity Solution\ServiceLayer.exe
O23 - Service: @%SystemRoot%\system32\snmptrap.exe,-3 (SNMPTRAP) - Unknown owner - C:\Windows\System32\snmptrap.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: NVIDIA Stereoscopic 3D Driver Service (Stereo Service) - NVIDIA Corporation - C:\Program Files (x86)\NVIDIA Corporation\3D Vision\nvSCPAPISvr.exe
O23 - Service: @%SystemRoot%\system32\ui0detect.exe,-101 (UI0Detect) - Unknown owner - C:\Windows\system32\UI0Detect.exe (file missing)
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: vssbrigde64 - AO Kaspersky Lab - C:\Program Files (x86)\Kaspersky Lab\Kaspersky Internet Security 16.0.0\x64\vssbridge64.exe
O23 - Service: @%SystemRoot%\system32\Wat\WatUX.exe,-601 (WatAdminSvc) - Unknown owner - C:\Windows\system32\Wat\WatAdminSvc.exe (file missing)
O23 - Service: @%systemroot%\system32\wbengine.exe,-104 (wbengine) - Unknown owner - C:\Windows\system32\wbengine.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)

--
End of file - 11432 bytes

I file missing che hai citato sono tutti file di sistema quindi non vanno eliminati, appaiono file inesistenti perchè HJT non li riconosce.
Per essere certo a cosa si riferiscono vai in Servizi e controlla ogni service trovato a cosa serve e che funzione ha, per far questo fai doppio clic su ogni voce e appare a cosa è collegato. Se vuoi eliminare qualche voce ve ne sono di inutili in Avvio automatico che possono rallentare l'avvio del PC, sono le voci 04, basterebbe solo l'antivirus.
Ciao