ClickStart ->Control panel ->double click Network Connections.
Right click on Wireless Network Connection and go to Properties.
On the Wireless Connection Properties Window, click on Wireless Networks,select your network and go to Properties.
In the next window, click on the Authentication tab, Make sure "Enable IEEE 802.1x...." check box is Unchecked -> click OK.
Then right click Wireless Network Connection and click View Available Wireless Networks.
Click Refresh Network list to view available wireless networks. Select the correct network which you want to connect, double click it or click Connect button.
If the wireless network is secured, it will pop up a window asking for the key/password. Enter the correct Key/Password then click Connect, wait for a while, you will connect to this wireless network.
If the same problem occurs again, please follow the instructions below to remove the profile and try to connect again.