First. I am relieved to learn you are not finding any conflict between Mathematica 13 and Windows 11 Pro. Second. A great many years ago a Nobel Laureate, Arthur Holly Compton made a careful study of the relationship between the dominant wavelength in an X Ray range energy field and the production of 'Recoil Electrons' at a given wavelength. My goal, to explain his findings in terms of the De Broglie wave / particle equations in units of electron volts. Among other wavelengths Compton reported 0.614 Angstroms (6.14 x 10 ^-9 centimeters) as especially productive of 'Recoil Electrons'. I wrote the equation (above) to search for the amount of energy in units of electron volts needed to produce non-relativistic waves at a wavelength of 0.614 angstroms. Before I tried 'FindRoot' I entered different values into the electron volt term (eV) in the equation above at the top of the page. A few minutes of labor and I arrived at 399.8 electron volts as able to produce X ray waves at 0.614 angstroms. Then I tried FindRoot. Your expression returns an unlikely value of 4.7 x 10^-6. So, next, I posted this plea for help.