Wireless keeps kicking me off line

Hi, I have a dell inspiron 300m with internal wireless and w/n past few days my wireless keeps booting me off line only at home. This is new this week, I’ve had the same internet set-up for past year. I have a DLINK modem and router. My roommate uses his wireless fine, with no problems. When i try my internet at work, wireless VPN access I have no problems. When i type run>cmb>ipconfig at home it gives me 0.0.0.0 for IP address. What is going on? Any help would be very much appreciated.