Hi ya thank you so much! I did exactly what you said and it worked, both laptops were working just fine yesterday but today for some reason my sister's laptop's is not connecting to the internet wirelessly.. it can't even detect the linksys wireless network!! The Wlan button is on and router is working fine, my laptop is working alright but my sisters laptop only connects to linksys if I use enthernet cable, what could be the problem?? I tried turning everything off and then turning on after a minute like you said still no luck. Also when I disconnected my laptop from linksys router and reconnected it said something like error the IP address is already in use by another computer (my sister's laptop is connected with ethernet wire). Could this be the problem? Please help I'm going crazy

thank you so much in advance!!