Restart the computer, with a bootable USB flash drive plugged in, and press F12 when the Dell logo appears to display the One Time Boot Menu. Using arrow keys, select USB Storage Device and press Enter.
If
no USB option is present, arrow down to BIOS Setup (or something like that) and press Enter. Look thru the "BIOS" options to see if USB booting may need to be enabled.
Please see also this Forum article:
https://forums.grc.com/threads/how-to-boot-and-run-spinrite-6-x-on-a-uefi-machine.968/
Since this LT is running Windows 11, it is booting in UEFI mode. UEFI boot and SpinRite 6.1 are incompatible. The article above "may" provide a way to change the boot mode to CSM if your LT supports that. If so, then booting off of a bootable USB flash drive with SpinRite on it will work.
Google does NOT seem clear on this CSM support.