There is a quick and easy way to eliminate the connection problems in windows xp, ie by exploiting features of "repair this connection". Easily you can directly detect what is happening with the connection.
Keep internet connection alive, then you need to have a utility program that is installed on the PC so the connection remains connected. Technique 'ping' that is used is basically a way to remind the system, that you are still connected to the internet and want to keep it that way.
Pinging means a small pile of data that is sent to the internet via a computer with a specific time interval, so the connection is not lost. Features 'repair this connection' of Windows XP can be found both for the Home edition or Professional