I don’t completely understand the steps you posted:
1-Formate computer - Does this mean that you formatted the disk to re-install Windows, or something else?
2-Used more than one version - no idea what this means.
3-Replaced by computer - no idea what this means.
Installation does not succeed
What other security software is installed?
What Antivirus did you use before Avast?
Peut-être que vous devez poster en français. Je suis sûr que quelqu'un peut traduire pour vous.
+1.
Nous ne vous comprends pas. ???
Entrez votre problème, en français, ici, s'il vous plaît.
=Perhaps you should post in french. I am sure that someone can translate for you.
+1.
We don't understand you.
Post your problem, in French, here please.