There was Windows 7 Home Premium on my machine before (Lenovo B575)and I could access the BIOS and Boot Menu pressing F2 and F12. I installed Windows 8 Enterprise version first and lost the ability to go into the BIOS. I upgraded this version to 8.1 with same results. In advanced option I don't have UEFI firmware setting tile. So I can't choose to get to the BIOS with this method. I have tried to go into the BIOS at the boot pressing F2 and many other keys with no result. The OS in both cases 8 and 8.1 hung several times during the installation process. I had to manually reboot machine during installation several times. After the windows were installed the system still can't shut down or restart normally and I have played with different settings in power / shutdown option. Please help. I need to be able to access my BIOS at boot or Windows level. Any help will be greatly appreciated. Thanks.

• Edited by Vishwa108 13 hours 56 minutes ago