Avast don't work anymore since I bought 2015 version

Hello everybody,
A couple of weeks ago, I bought Avast 2015 version. Now it crash during the launch (installation seems to be ok, computer restarted)
I only have this message from “avastui”:
Failed to load language dll [1033\UILangRes.dll]

Can you please tell me what can I do?
I try to fix it myself but I don’t know how to reload avast 2015.

Thanks for the answers!!

Hi, this is the English Forum. Please post in English
or Post here: https://forum.avast.com/index.php?board=21.0 :slight_smile: