I've been having this problem for 2 weeks. I am on Build 7057, and I'm using a Linksys WMP100 RangePlus Wireless card, which works great. It can detect my router with ease. The thing is, things such as FireFox, IE, and Windows Update are either incredibly slow, or they don't work at all. The IM app Pidgin works fine, though. Every other computer in the house works fine, though. The thing is, I can't rule my PC out, because my Wii and iPod connect very slowly to the internet. My connection was fine with build 7000, and even sporadically worked a few times with 7057. Drivers aren't a problem, since my Wireless Card + Windows + Router Firmware are up-to-date.