Wireless Problems

I have my computer connected to wireless network, before i moved to vista, i was running xp media center, and i had no problems with my connection, now i notice every now and then i get disconnected, when i click on my network i see other wireless routers listed under my opitons, i click refresh then i get connected again and the other routers are gone from my list, i do have a secure connection but it seems like everytime their signal move closer i get disconnected, i have changed channels on my router, i have moved the router to diffrent location but now isntead of one i get 2 diffrent routers, funny thing is my kids computer running xp wont loose the connection only mine. anybody have had this issue yet. or anybody has suggestion it would be greatly appreciated.