1. You can try to disable and re-enable your network connection a couple of times, sometimes that helps, if not the try the second step.
2. You can try to use the windows wireless zero configuration utility to netword instead of the config free, I have always had a problem using config free. If you go to start>control panel>network connections then right click on your wireless connection and click properties, then click on the wireless network tab and check the box that says,"Use windows to configure my wireless network settings". Then click ok. disable and re enable your wireless connection. Then right click your wireless connection and click properties and then view wireless networks. click the wireless network you want to connect to and then click the connect button.
Let me know if this works