The computer is accessing hard drive all the time and trying to run programs takes very long to open. F-Secure is indeed an active AV and it's my preference over Avira. AVG I've had at some point and it should be installed; I don't find it in installed programs list.
Logfile of Trend Micro HijackThis v2.0.5
Scan saved at 18:14:11, on 10.5.2017
Platform: Windows 7 SP1 (WinNT 6.00.3505)
MSIE: Internet Explorer v11.0 (11.00.9600.17840)
Boot mode: Normal
Running processes:
C:\Program Files (x86)\F-Secure\fshoster32.exe
C:\Program Files\GIGABYTE FORCE.exe...