Deadlock crashes with 'fatal error unable to find child'

that one's usually a broken install rather than your pc. right click deadlock in steam, properties, installed files, verify integrity. if it still does it after that, update your gpu driver and turn off overlays (discord, afterburner and so on) one at a time. last resort is uninstall, then delete whatever's left of the deadlock folder in steamapps/common before reinstalling, because a plain uninstall sometimes leaves the broken files behind.