I did abit of reaseach for you, I'm at work so couldnt have a thurer look, maybe this could be of some help.. found off a website
1. disable wireless zero's from running on your machine. to do this go to Start>Run> and type "MSCONFIG" select the services tab and scroll all the way to the bottem and uncheck the wireless zero's box. Restart the system and see if it works.
2. MS has a patch that is supposed to address the issue, but a search off of their site will get you to it.
3. Delete and reset up your network. By this I mean on all of your computers, new SSID assigned and DO NOT choose any wireless security. The disable the windows firewall and any thrid party fiirewall ( no worries, they can be turned on afterwards and your router is still running it's firewall). Bring everything back up (less setting up WEP or WPA) and your should be able to get online. Downside no WPA or WEP security.