It sounds to me that the wireless portion of your router may have fried. It's not uncommon, but it's certainly possible. Other than just resetting the router...have you tried to flash the firmware of your router? Downloading the latest firmware for your router? It's also possible that you are getting interference from someone's wireless. See you if you change it's wireless channell with a different SSID. Try that first....and if all else fails...you may need to get a new wireless router, or a dedicated WAP (Wireless Access Point) and connect that to your router.
Hope that this helps and good luck.
I'm having problems using my Linksys Wireless B router. I have 3 roommates and all 4 of our laptops are unable to use the wireless internet. It was working fine and messed up on all our laptops the same night. Our laptops are an HP Pavillion ze5500, a Compaq Presario v2000, and 2 Inspiron notebooks. All use Windows XP Home SP2.
The router shows up on the available networks, and we can all connect. But the internet itself will not work. However, I can connect with a Cat5 cable via the router and the internet is fine.
I've tried resetting the the router. I reset the IPconfig. Downloaded some programs from spychecker.com. I've read through some forums. I can't figure it out.