I have no problem with AION (retail eu or classic) with Windows 11.
I have some good hardware as well and AION didn't need it at all so CPU and GPU runs on a lower level (by default).
You should look into windows event logs and watch for error codes why the game crashes.
Also look into your device manager, update bios and drivers from your mainboard manufacture website.
I see it now .. you posted it in june, maybe your pc was to hot because of bad airflow in your computer-case?