The router may have died or you ran into that SSID issue I see often.
The pundits tell people to disable, I find I have to turn it back on.
My neighbor/friend and I share a wireless network/internet connection. For the past 6 months its worked great. Recently the wireless signal stopped showing up for me. It shows up just fine on my neighbors PC and also on my girlfriends laptop. I'm using a Linksys Compact Wireless-G USB Adapter - WUSB54GC. My drivers and firmware are all up to date, yet nothing shows up. I can pick up a bunch of other nearby wireless connections (other neighbors), but not my own. I've tried everything including resetting the wireless router (which is in my neighbors apartment), and re-installing my Linksys Adapter software. Nothing works. Any ideas?? Any help is very much appreciated.