More Info regarding the Question:
I installed a display driver from that site, and now winSAT.exe and conhost.exe processes run sometimes. I wondering whether they are safe or not. They are both located in system32 though.
(hkcmd.exe, igfxpers.exe and igfxtray.exe were added startup after the display driver installation and they are always running too. I found they are the the driver processes)
Hope your help to clarify this situation.