Zandermander 0 Light Poster

I have a Windows XP SP3 computer, AT&T Uverse with a 2wire router and 2wire usb wireless adapter on my desktop. It was working earlier today just fine, not quite sure what happened but now it will not connect to my WPA encrypted router. I can connect to other wireless networks in my neighborhood no problem, and right now i am connected to my router via my Droid and tethered to my computer...

I tried reinstalling the driver software that came with the adapter, i even system restored to an earlier date, I have no more ideas on how to fix this...

Any ideas?