Many modern PCs run the installed OS in UEFI mode. But almost all of them have a fallback mode which allows the hardware to be configured in the legacy mode called 'BIOS' mode. Here is how you can tell which mode exactly is used on your Windows 8.1 PC.
Press the Win + R hotkeys together on the keyboard and type the following command in your Run box:
msinfo32
In the System Summary section, look at the BIOS mode value in the right pane. It can have the value 'Legacy' or 'UEFI'. The legacy mode means that your hardware does not support UEFI, or that it's disabled for some compatibility reasons. In the screenshot below, you can see that my VirtualBox install of Windows 8.1 runs in the Legacy mode:
That's it. You can use this information in case you need to create some bootable media such as a USB stick. Using the output from MSInfo32, you can be sure which type of media to create.
MSInfo32 also lists the Secure Boot State, your PC's motherboard manufacturer and your BIOS Version/Date. It has plenty of interesting information about your PC.
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