Q. My game crashes when I shoot a gun or when someone in the party performs a Photon Blast.
A. Change your Windows Operating System’s Data Execution Prevention settings. You can find your current setting by going to the Windows Control Panel -> System -> Advanced System Settings -> “Performance” Settings -> “Data Execution Prevention” tab.
Select “Turn on DEP for essential Windows programs and services only” or add an exception for PsoBB.exe
maybe it helps