Oracle 11g XE 64bits installation problem on Windows 7
After more than 6 hours to fix this, I found this post which help me to understand the problem.

The problem was that I tried to install Oracle 11g XE with my user account connected on the enterprise domain. The installation process, then, wasn't able to connect to the database. I suspect that it try to connect to it from the enterprise domain, and not from localhost.

To solve this, I had to redo the installation with a local admin account on the computer and not as an admin user on my enterprise domain.

Found another post for reference.

I hope this answer will help other guy which encounter the same problem.