Hello,
This is usually a problem with the graphics driver.  You may need to update the graphics driver on your computer, e.g. as described in this earlier answer to the same problem:

<https://www.rbvi.ucsf.edu/pipermail/chimera-users/2021-May/017857.html>

I hope this helps,
Elaine
-----
Elaine C. Meng, Ph.D.                       
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco


> On Jan 11, 2022, at 6:58 AM, Nicola De Trino via Chimera-users <chimera-users@cgl.ucsf.edu> wrote:
>
> I have download the chimera-1.16-win64.exe for Windows 64 bit. I have installed but when i try to launch the program, it appears an error message : chimera exited abnormally; the exit code was: -1073731819.
> I try to install again the program but same result. I don't know how to fix the problem.
>
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