Check if your PC uses UEFI or BIOS

Long time Windows users might be well aware of the term – UEFI. For those who are not, UEFI is the abbreviated form of Unified Extensible Firmware Interface, a sort of BIOS replacement to set up the hardware and load and start an operating system. It was first introduced by Intel as Intel Boot Initiative which was later changed to EFI. Later, EFI was then taken over by the Unified EFI Forum and was therefore named as UEFI. UEFI comes with a boot manager which removes the needs for a separate boot loader. Besides, it gives you faster start-ups and better networking support. Most recent Windows 8 PCs are shipped with UEFI support. To check if your PC supports and uses UEFI/EFI or BIOS, follow the steps highlighted below.

Check if your PC uses UEFI or BIOS

(1) Open File Explorer and navigate to the following folder: C:\Windows\Panther.


In the folder named Panther you will see a text file titled setupact.log. The file will automatically open in Notepad.

setup act

Once you have opened setupact.log, click Ctrl+F to bring up the Find box and search for an entry named Detected Boot Environment.




Once you find Detected Boot Environment, you will notice the words BIOS or UEFI mentioned as follows:

Callback_BootEnvironmentDetect: Detected boot environment: BIOS


Callback_BootEnvironmentDetect: Detected boot environment: UEFI


If your PC supports and uses UEFI, the word UEFI will appear, else BIOS. (2) Alternatively, you can also open Run, type MSInfo32 and hit Enter to open System Information. uefi or bios If your PC uses BIOS, it will display Legacy. If it is using UEFI, it will display UEFI! If your PC supports UEFI, then if you go through your BIOS settings, you will see the Secure Boot option.

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Anand Khanse is the Admin of and a 10-year Microsoft MVP Awardee in Windows for the period 2006-16. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.