Wireless errors can pop up if you're running IEEE 802.1x
authentication, but are not actually in a 802.1x (EAP) environment, OR the connection
can be unreliable connecting to a known reliable WLS network.
Please go to:
Start --> Programs --> Accessories --> Communications
--> Network Connections --> Right-click your Connection and select
Properties --> Click on the Authentication tab --> Disable / uncheck the
option IEEE 802.1x authentication for this network.
Now, try to connect to your wireless network; are you able to? (Note: you may
need to restart the computer.)