I am having a Dell latitude laptop, this is running with windows 7 OS. my laptop is specified with intel processor, along with ATI radeon graphical interface, 3 GB RAM,320 GB hard drive and inbuilt specified with wifi connectivity. I usually connect my laptop with wireless network from both ,my home and office, the machine was working fine till the last date. But suddenly from last two days back whenever I tried to connect my laptop with the wireless network it flashes a message that the "MAC address is not defined". I am not having such information regarding this type of problem. What should I do to overcome from this problem? Any suggestion for me to resolve this suddenly happened problem.