I bought three Realtek Wireless USB Adaptors for my children's computers. They have HP laptops running on XP systems. I do not know why it will not connect. It says that it is connected but the connection is limited or there is none. I even went to sit by the cable modem to see if it needed to be closer but no good. I am about to send them back but I wanted to make sure I was not missing a step. The software loaded properly so I do not know what else I have to do. As I am sure you have guessed...I am not tech-savvy, so please speak in laymen's terms!!!