I recently upgraded my computer from windows xp home to windows xp professional. Now when i try to connece to my DSL provider, it says i cannot and i figured out why and its because i dont have a local area connection. When i go into device manager, the ethernet port has a yellow questino mark. Iv been trying to find out what driver to use but i cant seem to find anything. i wasdont understand how my lan just disappeared, what should i do?