Hi Gene,
There are several small free programs that will quickly test a computer for W11 compatibility:
https://www.majorgeeks.com/files/details/windows11compatibilitychecker.htmlhttps://www.majorgeeks.com/files/details/windows_11_compatibility_checker.htmlHere's a link to the Major Geeks search for Windows 11 compatibility, which shows lots more:
https://tinyurl.com/ms67jbxc***
Unfortunately, if your system lacks UEFI, it's probably time to take it out behind the barn and shoot it--there's no upgrade.
For some systems without the TPM 2.0 features, a fairly cheap chip can be installed--just buy it and plug it into the socket on the motherboard.
(There are also registry hacks for a missing TPM 2.0.)
If your graphics aren't up to snuff, you can probably install a suitable PCI card and remove the other card or turn it off in the BIOS if it's built-in on the motherboard.
Fortunately, W11 is still a ways off.
Cheers,
Carl Fogel