If you install the windows7 system, it is the use of broadband dial-up connection, broadband dial-up connection security settings have a free hanging settings will make your computer without moving a few minutes will be off the network, and then you can re dial the Internet, especially when downloading or when watching online video it will be dropped.You can solve it in the following ways.

打开控制面板网络和Internet 网络连接。选择宽带连接右键单击选择属性，然后选择宽带连接属性窗口中的选项卡，在挂起之前从不设置空闲时间。如上所述。