I had neshta A virus and used avg neshta to remove it. I wanted to make sure it was gone so I used diskpart; grabbed my acer windows 8 CD recovery. Then I switched boot in bios to legacy and boot priority to CD and reinstalled windows. During the installation I was fighting the virus. It would click, to the extent I see black dots where it clicks and kept bringing up OSK and randomly typing. Previously the laptop upgraded to windows 10 and used UEFI. Neshta A is a UEFI rootkit. I managed to install windows, boot into safe mode and run avg Neshta removal tool. Virus seemed gone. Windows defender identified it as Neshta A Trojan Virus. The next day my laptop powered off while using it; and I get the message "no operating system found", it also gave me the Acer logo that I would get before booting into windows 10 that used UEFI. There is no grey bar at the bottom displaying f2 and f12 options now. I've tried holding the power button down to make sure it was off. I used alt+f10, f2 , f12, Del, shift+f8, holding esc,f2,or del while powering up don't work. I can't boot to bios or windows. It won't boot from USB or CD. Took ram and battery out. Held power button for over 30 seconds and let my laptop sit unplugged without battery or ram for 24 hours. Still only boots to Acer logo. Where it goes to operating system not found black screen. I can ctrl+alt+del go back to Acer screen or restart manually. What can I do to install an operating system and remove the virus?