Open the network and sharing center, then click (down the left side) 'Change adapter settings'. Right click on Wireless Network Connection, and click Properties. In the white box, find 'Internet Protocol Version 4 (TCP/IPv4)'. Click on it then click properties. Make sure that the 'Obtain an IP address automatically' and 'Obtain DNS server address automatically' buttons are checked. If they arent, select them and click ok. Restart and try to reconnect.
Let me know if that works.