Project Settings can not be opened

Hello everyone, I am unable to open the 'project settings', no matter wich version of unity I try (currently on 2019.1.4f1). I reinstalled unity, created a new project, deleated the cache and appdata folder but couldn't get it to open. The button stays unresponsive. If anyone has an idea, what else I could try, Id be more than happy, as I can not continue without that window...