Chiedo cortesemente un controllo anche se mi sembra che il pc funzioni correttamente. Grazie.

Logfile of Trend Micro HijackThis v2.0.5
Scan saved at 12:46:20, on 20/02/2017
Platform: Windows 7 SP1 (WinNT 6.00.3505)
MSIE: Internet Explorer v11.0 (11.00.9600.18538)

FIREFOX: 51.0.1 (x86 it)
Boot mode: Normal

Running processes:
C:\Windows\system32\taskhost.exe
C:\Windows\system32\Dwm.exe
C:\Windows\Explorer.EXE
C:\Windows\System32\igfxtray.exe
C:\Windows\System32\igfxpers.exe
C:\Program Files\Avira\Antivirus\avgnt.exe
C:\Windows\PixArt\Pac207\Monitor.exe
C:\Program Files\Hewlett-Packard\Digital Imaging\bin\hpotdd01.exe
C:\Windows\system32\igfxsrvc.exe
C:\Program Files\Avira\Launcher\Avira.Systray.exe
C:\Program Files\Java\jre1.8.0_121\bin\javaw.exe
C:\Program Files\Microsoft Office\Office15\OUTLOOK.EXE
C:\Windows\system32\taskeng.exe
D:\ICONE\HijackThis\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/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 =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O2 - BHO: Skype for Business Click to Call BHO - {31D09BA0-12F5-4CCE-BE8A-2923E76605DA} - C:\Program Files\Microsoft Office\Office15\OCHelper.dll
O2 - BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.8.0_121\bin\ssv.dll
O2 - BHO: URLRedirectionBHO - {B4F3A835-0E21-4959-BA22-42B3008E02FF} - C:\PROGRA~1\MICROS~1\Office15\URLREDIR.DLL
O2 - BHO: Microsoft SkyDrive Pro Browser Helper - {D0498E0A-45B7-42AE-A9AA-ABA463DBD3BF} - C:\PROGRA~1\MICROS~1\Office15\GROOVEEX.DLL
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre1.8.0_121\bin\jp2ssv.dll
O4 - HKLM\..\Run: [IgfxTray] C:\Windows\system32\igfxtray.exe
O4 - HKLM\..\Run: [Persistence] C:\Windows\system32\igfxpers.exe
O4 - HKLM\..\Run: [avgnt] "C:\Program Files\Avira\Antivirus\avgnt.exe" /min
O4 - HKLM\..\Run: [Avira SystrayStartTrigger] "C:\Program Files\Avira\Launcher\Avira.SystrayStartTrigger.exe"
O4 - HKLM\..\Run: [Monitor] C:\Windows\PixArt\PAC207\Monitor.exe
O4 - HKLM\..\Run: [DeviceDiscovery] C:\Program Files\Hewlett-Packard\Digital Imaging\bin\hpotdd01.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')
O8 - Extra context menu item: E&sporta in Microsoft Excel - res://C:\PROGRA~1\MICROS~1\Office15\EXCEL.EXE/3000
O8 - Extra context menu item: I&nvia a OneNote - res://C:\PROGRA~1\MICROS~1\Office15\ONBttnIE.dll/105
O9 - Extra button: Invia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\Program Files\Microsoft Office\Office15\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: I&nvia a OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\Program Files\Microsoft Office\Office15\ONBttnIE.dll
O9 - Extra button: Lync - Chiamata con un clic - {31D09BA0-12F5-4CCE-BE8A-2923E76605DA} - C:\Program Files\Microsoft Office\Office15\OCHelper.dll
O9 - Extra 'Tools' menuitem: Lync - Chiamata con un clic - {31D09BA0-12F5-4CCE-BE8A-2923E76605DA} - C:\Program Files\Microsoft Office\Office15\OCHelper.dll
O9 - Extra button: &Note collegate di OneNote - {789FE86F-6FC4-46A1-9849-EDE0DB0C95CA} - C:\Program Files\Microsoft Office\Office15\ONBttnIELinkedNotes.dll
O9 - Extra 'Tools' menuitem: &Note collegate di OneNote - {789FE86F-6FC4-46A1-9849-EDE0DB0C95CA} - C:\Program Files\Microsoft Office\Office15\ONBttnIELinkedNotes.dll
O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics
O18 - Protocol: osf - {D924BDC6-C83A-4BD5-90D0-095128A113D1} - C:\Program Files\Microsoft Office\Office15\MSOSB.DLL
O18 - Filter hijack: text/xml - {807583E5-5146-11D5-A672-00B0D022E945} - C:\Program Files\Common Files\Microsoft Shared\OFFICE15\MSOXMLMF.DLL
O23 - Service: Adobe Active File Monitor V6 (AdobeActiveFileMonitor6.0) - Unknown owner - C:\Program Files\Adobe\Photoshop Elements 6.0\PhotoshopElementsFileAgent.exe
O23 - Service: Adobe Acrobat Update Service (AdobeARMservice) - Adobe Systems Incorporated - C:\Program Files\Common Files\Adobe\ARM\1.0\armsvc.exe
O23 - Service: Avira Protezione email (AntiVirMailService) - Avira Operations GmbH & Co. KG - C:\Program Files\Avira\Antivirus\avmailc7.exe
O23 - Service: Avira Pianificatore (AntiVirSchedulerService) - Avira Operations GmbH & Co. KG - C:\Program Files\Avira\Antivirus\sched.exe
O23 - Service: Avira Protezione in tempo reale (AntiVirService) - Avira Operations GmbH & Co. KG - C:\Program Files\Avira\Antivirus\avguard.exe
O23 - Service: Avira Service Host (Avira.ServiceHost) - Avira Operations GmbH & Co. KG - C:\Program Files\Avira\Launcher\Avira.ServiceHost.exe
O23 - Service: CLHNServiceForPowerDVD - Unknown owner - C:\Program Files\CyberLink\PowerDVD11\Kernel\DMP\CLHNServiceForPowerDVD.exe
O23 - Service: CyberLink PowerDVD 11.0 Monitor Service - CyberLink - C:\Program Files\CyberLink\PowerDVD11\Common\MediaServer\CLMSMonitorService.exe
O23 - Service: CyberLink PowerDVD 11.0 Service - CyberLink - C:\Program Files\CyberLink\PowerDVD11\Common\MediaServer\CLMSServer.exe
O23 - Service: FLEXnet Licensing Service - Macrovision Europe Ltd. - C:\Program Files\Common Files\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: Servizio Google Update (gupdate) (gupdate) - Google Inc. - C:\Program Files\Google\Update\GoogleUpdate.exe
O23 - Service: Servizio Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Program Files\Google\Update\GoogleUpdate.exe
O23 - Service: Mozilla Maintenance Service (MozillaMaintenance) - Mozilla Foundation - C:\Program Files\Mozilla Maintenance Service\maintenanceservice.exe

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End of file - 6581 bytes

Che problemi riscontri?
Mi pare sia tutto apposto, ci sono troppe voci riferite ad Office ma penso sia normale (mai usato Office di Microsoft)
Aspetta comunque qualche altro consiglio