In case anyone is interested, I backed up my data and then changed the setting. TPM enabled automatically in the BIOS. I restarted and Windows booted up just fine.
I have an Alienware m15 R1 with Windows 10 and I would like to upgrade to Windows 11 but I do not currently have TPM installed. After some research I determined that I need to first disable “Legacy Option ROMs” in the UEFI settings before I can enable TPM. When I toggle that setting, I get a warning that “Attention! Changing this setting may prevent your operating system from booting or require a reinstall. Are you sure you would like to continue?” Can anyone confirm if I can safely change that setting without needing to reinstall Windows? I really don’t want to go through all of that. [IMAGE]  
m15 R1, safe to disable “Legacy Option ROMs”