Windows 11 PC unsuitable for Windows 11

Running Windows Update returns “This PC doesn’t currently meet the minimum system”? I have another PC with Windows 11 on so I made a clone of its hard drive and fitted it in the unsuitable PC and Bingo it run fine so why do get this message. One problem I have is I like to use Windows Live Mail as an email server and I have it loaded on Windows 11 and it receives emails ok but will not send. When I try I get an error message the same one as on opening the program which I press the “Ignore” button