Windows 7 WIFI Adapter Status Loged On While Not In Vicinity Of WFI Network

First of all every time I am logged on to my WIFI at home, after a couple of hours, I get told that I am loged on to two WIFI networks (A and B), whilst I only get one set of bars in my statusdisplay (bottom right). When I switch off WIFI, network centre keeps telling me I am loged on to WFI B. A is the SSID and B is the typenumber of teh router I have, so there is only one WIFI signal. Secondly, after being logged on to my home WIFI, All activity seizes, I can not load pages, check e-mail, or anything. I can access my router and it tells me everything is ok, but packages seem to come to a halt. My PS3 can be online, so the problem is in my laptop I think. I have tried releasing and renewing my IP and resetting my router, but only rebooting my laptop helps.