Laptop seems to interrupt router broadcast...?

Download the program "Net Stumbler" and see if there are any other routers in range of yours that are on the same channel. It will tell you what channel they are on, simply log in to the router and change the wireless channel to one different than the other networks. Also, do you have trouble connecting to other wireless networks? It could possibly be you computers wireless card has finally gone bad. If the laptop ruins the connection for the other computer that runs via wireless, then defiantly try the channel thing. Multiple routers on the same channel will interfere with each other. When my mom lived in one of her first apartments, the only way I could get online was to steal internet from the neighbors, and they where all on the same channel (6) and I couldn't stay connected for 30 seconds without getting kicked off. So I downloaded net stumbler, and connected to all the unsecured networks, and changed their channels. lol. I hope this works for you, it really sucks having to go buy a new wireless card, I love being able to move around with my laptop. :P Good luck!