That may be the case (Good Morning from DownUnder, headed for my 3rd coffee momentarily
UEFI is the new name for BIOS, but we can call it Setup Utility to avoid confusion. My Dell allows use of the mouse in it. You enter it through the use of a Function key, which may be Esc, F2, F10, F12, or Delete.
And can I run Linux Lite directly off a DVD to test it?
Yes. Most Linux Distros (Distributions) allow the facility of running Live.
If you choose to use a DVD, you would download the .iso file from LL's website (Tom gave the links above) to your Windows, then follow the below
In windows 10 you can simply right click an iso and select to burn it to a disk.
- Insert a blank CD or DVD in your writable optical drive.
- Right-click on the ISO file and select "Burn disk image."
- Select "Verify disc after burning" to make sure the ISO was burned without any errors.
- Click Burn
You likely have 2 of those Functions keys that will allow access to the Setup. One will simply show you the Boot Order Sequence and the other allows full access to all aspects of the Setup.
So when you have burned the DVD, reboot the computer with the disk in place, enter the Setup and choose to temporarily or permanently place your DVD drive ahead of your hard drive to boot.
This will then take you to the LInux Lite Live environment. There, you can choose to
not install, but just wander around the environment seeing if you like the look and feel, try out your wifi, audio, graphics, even see if it recognises your printers, &c.
During the Live session, any changes you make, downloads you perform, documents you generate, will only be saved to RAM and lost when you reboot.
When you reboot, just pop the DVD out and you will be returned to Windows.
Cheers
Wizard