Didn't find where "init.db" is.
I'm reinstalling with kaspersky turned off and as admin. Didn't have error message this time, it asked for locale I choosed "english, united kingdom". After installation finished, I had new windows "stack builder 3.1.0" asking which application I want to install :
I don't know which one I have to thick or maybe nothing and simply close this windows ?
It's really difficult to get this work, never had such problems to install a software.
Edit : I can see 9.1 running in task manager.