You're sitting in the conference room at work, using the weak office Wi-Fi during a meeting. Then, you go to your desk and plug in to the speedy Ethernet connection, but your laptop is still using the Wi-Fi network for Internet. To get your best connection, you can hit disconnect on all your wireless connections until the Ethernet takes over, or you can change Windows' messed-up network preferences.
To change the order in which Windows connects to available networks, click Change Adapter Settings in the Network and Sharing section of the Control Panel. Hit the Alt key, and select Advanced Settings from the Advanced menu. You can then rank connections from most to least important using the up and down arrows. We recommend putting your Ethernet connection on top.