Make sure that the drivers and software that came with your wireless card are installed
Verify that your computer is NOT configured to use a proxy server
Make sure the latest service packs and updates are made to your operating system
Allow me to connect to the selected wireless network even though it is not secure:
Software such as AOL, Net Zero or other ISP software can interfere with your computer ability to connect to the wireless network - we recommend either removing the suspect software or contacting the particular software's technical support
Spyware and Internet Explorer tool bar add-ons can interfere with your computer ability to connect to the wireless network - we recommend running an anti-spyware tool such as SpyBot or Ad-aware