Vista Can't Detect Wireless Network

I have a Fuji Lifebook S Series laptop running with Windows Vista. Earlier it was working fine with all wireless networks, including my own Home wireless. Don’t know what happened to it suddenly now it wont detect it anymore. I tested it connecting various other wireless networks in public places. I found it can connect few of them without any problem but wont connect some of them.

Same thing is happening with my home network. There are 2 more other laptops running with XP and they are able to connect fine, only this Fujitsu is the one which is not detecting my network anymore.

Any idea what is wrong with the laptop? How can I fix it? Thanks in advance.

Did it stop connecting your home network after you connected the laptop with some other wireless network? This could be the case because connecting to an outside Wireless some setting change so it does not match any more your Home setting. Also try diagnosing your wireless adapter, it will reset if there is any settings changed. For more troubleshooting steps, check out this url.