On Windows 8, it was possible to forget a WiFi network easily via a simple right-click from the Network side panel. But since the update in 8.1, the task is more difficult. Indeed, the only way to make forgetting is when an attempt to connect fails. It is only then that Windows will suggest you forget it. Otherwise, prefer our method described in this article.
Convenient in a mobility situation, Wi-Fi is much slower than the cable. However, Windows tends to always prefer wireless even if you connect a cable to your ethernet port. A somewhat radical method to overcome this problem is to disable WiFi. Discover in this article, a much simpler and practical method.